Pernah dengar tentang Massa Atom Relatif atau yang biasa dilambangkan dengan Ar? Yuk, ketahui rumus massa atom relatif dan cara menghitungnya dengan membaca artikel berikut!
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Apa yang ada di pikiran kamu saat mendengar kata ‘atom’? Mungkin kamu mikirin bom atom? Atau kamu malah mikirin kacang atom? Duh, iyaya, sore-sore gini enaknya nyemilin kacang atom, nih!
Sayangnya, yang hari ini mau aku bahas bukan kacang atom ya, tapi atom yang biasa kita temuin dalam ilmu kimia. Eh, tapi kalau kamu mau baca artikel ini sambil ngemilin kacang atom juga nggak papa yak, bebas hihiw.
Kita mulai dari dasarnya dulu, deh. Sebenarnya, atom itu apa sih?
Atom dan Partikel Penyusun Atom
Atom adalah unsur kimia terkecil setelah nuklir, yang dapat berdiri sendiri dan dapat bersenyawa dengan atom yang lain. Partikel atom terdiri atas proton dan neutron, serta dikelilingi oleh elektron.
Hayoo, udah pada tahu belum apa itu proton, neutron, dan elektron? Apa sih perbedaannya? Biar paham coba simak list di bawah ini:
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Proton adalah partikel bermuatan listrik positif yang terdapat di dalam inti atom.
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Neutron adalah partikel inti atom yang tidak bermuatan listrik dan massanya sedikit lebih besar daripada massa proton.
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Elektron adalah satuan muatan listrik negatif yang mengelilingi proton dan neutron.
Duh, bingung ya, namanya mirip-mirip gitu? Nah, biar makin paham, kamu bisa membaca sambil melihat gambar atom di bawah ini, ya!
Gambar atom (Sumber: radiologycafe.com)
Kalau diilustrasikan, bentuk atom itu kira-kira seperti gambar di atas, guys. Jadi, atom itu terdiri atas inti atom (nukleus) yang tersusun dari proton yang bermuatan listrik positif dan neutron yang tidak bermuatan listrik. Kemudian, di sekeliling nukleus ada elektron yang bermuatan listrik negatif. Sudah paham ya, sampai sini?
Baca juga: Apa Itu Rumus Empiris? Yuk, Kita Bedah Sampai Tuntas!
Nah, seperti yang tadi udah dibilang di atas, atom itu kan unsur kimia terkecil, terus gimana ya, cara kita menghitung massa atom? Kalau benda-benda biasa kan bisa kita hitung massanya pakai timbangan, terus kalau atom kita ngitungnya pakai apa? Apakah pakai timbangan juga?
Perbedaan Massa Atom dan Massa Atom Relatif (Ar)
Jadi, ternyata massa atom itu nggak bisa diukur dengan cara ditimbang guys, karena atom kan keciiiilll banget, jadi massanya pun juga terlalu keciiiiiil untuk dihitung dengan cara ditimbang. Tapi, massa atom bisa ditentukan dengan alat spektrometer massa. Alat ini bukan berupa neraca/timbangan, tapi berupa alat rekayasa teknologi yang mampu menentukan massa partikel-partikel yang sangat kecil seperti atom.
Hasil pembacaan dari spektrometer massa atau disebut juga sebagai spektrograf yakni berupa kurva yang menunjukkan massa atom dan persentase kelimpahan dari isotop-isotop suatu unsur yang terdapat di alam. Gambar spektrometer sendiri bisa kamu cek di infografik berikut. Check it out!
Berarti kalau mau tahu massa atom, kita harus pakai spektrometer massa, ya?
Jawabannya: nggak juga, lho!
Kita tetap bisa menghitung massa atom tanpa menggunakan spektrometer massa, tapi yang kita hitung itu adalah massa atom relatifnya. Massa atom relatif adalah massa suatu atom yang ditentukan dengan cara membandingkan massa atom standar. Massa atom relatif ini disimbolkan dengan Ar dan tidak memiliki satuan.
Dalam teori atom Bohr, disebutkan bahwa atom-atom dari unsur tertentu di alam dapat memiliki massa yang berbeda-beda. Oleh karena itu, massa atom relatif dari suatu unsur dihitung berdasarkan massa atom rata-rata dari keseluruhan isotop stabil yang terdapat di alam dibandingkan dengan massa atom standar.
Jadi, massa atom relatif ini bisa kita hitung tanpa spektrometer massa dengan cara membandingkan dengan massa atom standar. Kenapa dibandingkan? Analoginya gini. Sama halnya saat kita membeli buah jeruk di pasar, penjual akan menggunakan neraca duduk untuk menghitung massa jeruk yang kita beli. Penjual akan membandingkan massa jeruk dengan massa anak beban yang ada. Misalnya, kita mau beli 1 kg jeruk, maka penjual akan menggunakan anak beban yang massanya juga 1 kg. Nah, anak beban inilah yang digunakan sebagai standar ketika menghitung massa suatu benda (dalam hal ini yaitu buah jeruk).
Baca juga: Mempelajari Konsep Reaksi Redoks (Reduksi-Oksidasi)
Rumus dan Cara Menghitung Massa Atom Relatif (Ar)
Lalu, kalau menghitung massa atom relatif (Ar), standarnya apa nih?
Berdasarkan IUPAC (International Union of Pure and Applied Chemistry), atom yang digunakan sebagai standar penentuan massa atom relatif adalah atom karbon (C-12).
Kamu bisa melihat rumus massa atom relatif alias rumus Ar pada gambar berikut.
Kenapa atom C-12 yang dijadikan standar? Atom C-12 digunakan sebagai standar atau pembanding untuk menentukan suatu unsur, karena atom C-12 memiliki isotop yang paling banyak terdapat di alam dan paling stabil. Isotop adalah atom yang memiliki nomor atom sama, tetapi nomor massanya berbeda. Contohnya yaitu isotop C-12 dan C-13.
Atom karbon C-12 memiliki massa sebesar 12 satuan massa atom bisa ditulis 12 sma atau 12 amu (atomic mass unit). Dalam satuan kg, massa atom karbon C-12 adalah sebesar 20,04 x 10-27 kg. Karena atom C-12 ini digunakan sebagai standar, maka satu satuan massa atom didefinisikan sebagai suatu massa yang besarnya tepat sama dengan seperdua belas massa satu atom C-12.
Nah, seperti sudah dibahas di infografik tadi, massa 1 atom hidrogen adalah 1,67 x 10-27 kg, alias 1/12 dari massa atom C-12. Maka dalam satuan sma, massa 1 atom hidrogen dapat dianggap sama dengan 1 sma.
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Gimana? Pusing, ya? Kalau kamu bingung dan ada pertanyaan, langsung aja tanyain ke RoboguruPlus! Pertanyaan kamu akan dijawab oleh Tutor yang ahli pada bidangnya masing-masing, lho. Yuk, tanya sekarang!
Sekarang, kita lanjut lagi, ya!
Kalau kamu perhatikan rumus Ar tadi, untuk menghitung Ar atau massa atom relatif, kita harus menghitung massa rata-rata dari 1 atom unsur yang mau kita hitung. Kenapa kita harus menentukan massa atom rata-rata dari setiap unsur?
Jadi, atom-atom unsur yang sama, tidak selalu mempunyai massa yang sama. Kita bisa menganalogikannya dengan massa butiran beras. Meskipun dari jenis beras yang sama, tapi antara satu butir beras dengan butiran beras lainnya, massanya tidak persis sama. Ada yang lebih berat sedikit, ada yang lebih ringan sedikit. Nggak akan sama persis massanya. Nah, sama halnya dengan atom–atom unsur. Meskipun berasal dari unsur yang sama, tapi massanya berbeda-beda. Inilah yang kita kenal sebagai isotop.
Misalnya, atom karbon ada yang mempunyai massa 12 sma dan 13 sma. Dengan adanya isotop tersebut, maka massa atom rata-rata dari atom karbon adalah rata-rata massa atom dari keseluruhan isotop stabil atom yang ada di alam.
Sedangkan, isotop yang tidak stabil atau radioisotop yaitu isotop yang bersifat radioaktif. Radioisotop tidak dipertimbangkan dalam penentuan massa atom rata-rata, karena dapat dengan cepat meluruh menjadi unsur lain.
Baca juga: Bentuk Molekul berdasarkan Teori Domain Elektron dan Teori Hibridisasi
Untuk menghitung massa atom rata-rata dari suatu unsur X, dapat dirumuskan dengan:
Keterangan:
% isotop 1 = kelimpahan isotop pertama
% isotop 2 = kelimpahan isotop kedua
massa isotop 1 = massa atom isotop pertama
massa isotop 2 = massa atom isotop kedua
dan seterusnya (jika ada lebih dari 2 isotop, maka bisa menggunakan perkalian yang sama dengan isotop pertama dan kedua).
Oke, biar pemahaman kamu jadi lebih mantap, kita langsung aplikasikan aja ke latihan soal, ya!
Contoh Soal
Atom klorin (Cl) di alam tersedia dalam dua macam isotop, yaitu 75% sebagai Cl-35 yang bermassa 35 sma dan 25% sebagai Cl-37 yang bermassa 37 sma. Hitunglah massa atom relatifnya!
Penyelesaian:
Pertama-tama, kita hitung massa rata-rata 1 atom unsur klorin terlebih dahulu menggunakan rumus seperti berikut.
Lalu, setelah mengetahui massa atom rata-rata dari unsur klorin, selanjutnya kita hitung massa atom relatifnya menggunakan rumus Ar seperti berikut.
Jadi, massa atom relatif atau Ar dari klorin tersebut adalah sebesar 0,355. Eits ingat, menulisnya tanpa satuan ya, karena seperti tadi sudah kita bahas, massa atom relatif tidak mempunyai satuan.
Gimana, guys? Sudah paham kan tentang massa atom relatif? Biar makin mahir dalam menghitung massa atom relatif, kamu harus memperbanyak latihan soal, ya. Kalau kamu mau belajar materi Kimia kelas 10 lainnya, kamu bisa lho membaca artikel-artikel lain di ruangbaca dan menonton video belajar beranimasi di ruangbelajar! Yuk, tingkatkan terus kemampuan belajarmu bersama Ruangguru!
Sumber Gambar:
Gambar ‘Atom’ [Daring]. Tautan: https://www.radiologycafe.com/wp-content/uploads/2021/04/science-atom.png (Diakses: 9 Juni 2022)
Artikel ini pertama kali ditulis oleh Fahri Abdillah dan telah diperbarui oleh Kenya Swawikanti pada 14 Juni 2022.
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<h1 class="content-title">
Rumus Massa Atom Relatif (Ar) dan Cara Menghitungnya | Kimia Kelas 10 </h1>
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<p class="content-author"><a href="https://www.ruangguru.com/blog/author/kenya-swawikanti" class="">Kenya Swawikanti</a> </p>
<p class="content-info"><span>June 14, 2022 • </span> <span>7 minutes read</span></p>
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<p style="text-align: justify;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Menghitung%20Massa%20Atom%20Relatif%20(Ar).jpg" alt="Cara Menghitung Massa Atom Relatif (Ar)" width="820" loading="lazy" style="width: 820px; margin-left: auto; margin-right: auto; display: block;"></p>
<blockquote>
<p style="text-align: center;"><span style="color: #000000;"><em>Pernah dengar tentang Massa Atom Relatif atau yang biasa dilambangkan dengan Ar? Yuk, ketahui rumus massa atom relatif dan cara menghitungnya dengan membaca artikel berikut!</em></span></p>
<p style="text-align: center;"><span style="color: #000000;"><em>—</em></span></p>
</blockquote>
<p style="text-align: justify;"><span id="more-2812"></span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="color: #000000;">Apa yang ada di pikiran kamu saat mendengar kata <a href="/blog/eksplorasi-5-jenis-model-atom" rel="noopener" style="font-weight: bold;">‘atom’</a>? Mungkin kamu mikirin bom atom? Atau kamu malah mikirin kacang atom? Duh, iyaya, sore-sore gini enaknya nyemilin kacang atom, nih!</span></p>
<p style="text-align: justify;"><span style="background-color: transparent; color: #000000;">Sayangnya, yang hari ini mau aku bahas bukan kacang atom ya, tapi atom yang biasa kita temuin dalam ilmu kimia. Eh, tapi kalau kamu mau baca artikel ini sambil ngemilin kacang atom juga nggak papa yak, bebas hihiw.</span></p>
<p style="text-align: justify;"><span style="background-color: transparent; color: #000000;">Kita mulai dari dasarnya dulu, deh. Sebenarnya, atom itu apa sih?</span></p>
<p style="text-align: justify;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;"><span style="background-color: transparent; color: #000000;">Atom dan Partikel Penyusun Atom</span></h2>
<p style="text-align: justify;"><span style="background-color: transparent; color: #000000;"><span style="font-weight: bold;">Atom adalah</span> unsur kimia terkecil setelah nuklir, yang dapat berdiri sendiri dan dapat bersenyawa dengan atom yang lain. Partikel atom terdiri atas <span style="font-weight: bold;">proton</span> dan <span style="font-weight: bold;">neutron</span>, serta dikelilingi oleh <span style="font-weight: bold;">elektron</span>. </span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="background-color: transparent;"><em>Hayoo</em>, udah pada tahu belum apa itu proton, neutron, dan elektron? Apa sih perbedaannya? Biar paham coba simak <em>list</em> di bawah ini:</span><span style="background-color: transparent;"></span></span></p>
<ul>
<li style="text-align: justify;"><span style="background-color: transparent; color: #000000;"><strong>Proton</strong> adalah partikel bermuatan listrik <strong>positif</strong> yang terdapat di dalam inti atom.</span></li>
<li style="text-align: justify;"><span style="color: #000000;"><strong>Neutron</strong> adalah <span style="background-color: transparent; font-size: 16px;">partikel <strong>inti atom</strong> yang <strong>tidak bermuatan</strong> listrik dan massanya sedikit lebih besar daripada massa proton.</span></span></li>
<li style="text-align: justify;"><span style="color: #000000;"><strong>Elektron</strong> adalah <span style="background-color: transparent; font-size: 16px;">satuan muatan listrik <strong>negatif</strong> yang mengelilingi proton dan neutron.</span></span></li>
</ul>
<p style="text-align: justify;"><span style="background-color: transparent; color: #000000;">Duh, bingung ya, namanya mirip-mirip gitu? Nah, </span><span style="background-color: transparent; color: #000000;">biar makin paham, kamu bisa membaca sambil melihat gambar atom di bawah ini, ya!</span><span style="background-color: transparent; color: #000000;"></span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="background-color: transparent; color: #000000;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/gambar%20atom.png" alt="gambar struktur atom" width="450" loading="lazy" style="width: 450px; margin-left: auto; margin-right: auto; display: block;"></span></p>
<p style="text-align: center;"><span style="color: #000000;"><em><span style="background-color: transparent;">Gambar atom (Sumber: radiologycafe.com)</span></em></span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="color: #000000;">Kalau diilustrasikan, bentuk atom itu kira-kira seperti gambar di atas, <em>guys</em>. Jadi, atom itu terdiri atas <span style="font-weight: bold;">inti atom (nukleus)</span> yang tersusun dari <span style="font-weight: bold;">proton</span> yang bermuatan listrik positif dan <span style="font-weight: bold;">neutron</span> yang tidak bermuatan listrik. Kemudian, di sekeliling nukleus ada <span style="font-weight: bold;">elektron</span> yang bermuatan listrik negatif. Sudah paham ya, sampai sini?</span></p>
<p style="text-align: justify; font-weight: bold;"><span style="color: #000000;">Baca juga: <a href="/blog/mengetahui-cara-menentukan-rumus-empiris-senyawa" rel="noopener">Apa Itu Rumus Empiris? Yuk, Kita Bedah Sampai Tuntas!</a></span></p>
<p style="text-align: justify;"><span style="color: #000000;">Nah, seperti yang tadi udah dibilang di atas, atom itu kan unsur kimia terkecil, terus gimana ya, cara kita menghitung massa atom? Kalau benda-benda biasa kan bisa kita hitung massanya pakai timbangan, terus kalau atom kita ngitungnya pakai apa? Apakah pakai timbangan juga?</span></p>
<p style="text-align: justify;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;"><span style="background-color: transparent; color: #000000;">Perbedaan Massa Atom dan Massa Atom Relatif (Ar)</span></h2>
<p style="text-align: justify;"><span style="color: #000000;"><span style="color: #000000;">Jadi, ternyata </span><span style="background-color: transparent;">massa atom itu <span style="font-weight: bold;">nggak bisa diukur dengan cara ditimbang</span> <em>guys</em>, karena atom kan keciiiilll banget, jadi massanya pun juga terlalu keciiiiiil untuk dihitung dengan cara ditimbang. </span></span><span style="color: #000000;"><span style="background-color: transparent;">Tapi, massa atom bisa ditentukan dengan alat <span style="font-weight: bold;">spektrometer massa</span>. Alat ini <span style="font-weight: bold;">bukan berupa neraca/timbangan</span>, tapi berupa alat rekayasa teknologi yang mampu menentukan massa partikel-partikel yang sangat kecil seperti atom.</span></span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="background-color: transparent;">Hasil pembacaan dari spektrometer massa atau disebut juga sebagai <span style="font-weight: bold;">spektrograf</span> yakni berupa <span style="font-weight: bold;">kurva</span> yang menunjukkan massa atom dan persentase kelimpahan dari isotop-isotop suatu unsur yang terdapat di alam. Gambar spektrometer sendiri bisa kamu cek di infografik berikut. <em>Check it out!</em></span></span></p>
<p style="text-align: justify;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Alat%20Spektrometer%20Massa.jpg" alt="Alat Spektrometer Massa" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Berarti kalau mau tahu massa atom, kita harus pakai spektrometer massa, ya?</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Jawabannya: nggak juga, lho!</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Kita tetap bisa menghitung massa atom tanpa menggunakan spektrometer massa, <span style="font-weight: normal;">tapi</span> yang kita hitung itu adalah <span style="font-weight: bold;">massa atom relatifnya</span>. <span style="font-weight: bold;">Massa atom relatif adalah</span> massa suatu atom yang ditentukan dengan cara <span style="font-weight: bold;">membandingkan massa atom standar</span>. <span style="font-weight: normal;">Massa atom relatif</span> ini disimbolkan dengan <span style="font-weight: bold;">Ar </span><span style="font-weight: normal;">dan</span><span style="font-weight: bold;"> tidak memiliki satuan</span>.</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Dalam <a href="/blog/macam-macam-model-atom" rel="noopener"><span style="font-weight: bold;">teori atom Bohr</span></a>, disebutkan bahwa atom-atom dari unsur tertentu di alam dapat memiliki massa yang berbeda-beda. Oleh karena itu, <span style="font-weight: bold;">massa atom relatif</span> dari suatu unsur <span style="font-weight: bold;">dihitung berdasarkan</span> <span style="font-weight: bold;">massa atom rata-rata</span> dari keseluruhan <span style="font-weight: bold;">isotop stabil</span> yang terdapat di alam dibandingkan dengan <span style="font-weight: bold;">massa atom standar</span>. </span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Jadi, massa atom relatif ini bisa kita hitung tanpa spektrometer massa dengan cara membandingkan dengan massa atom standar. Kenapa dibandingkan? Analoginya gini. </span></span><span style="background-color: transparent;"><span style="color: #000000;">Sama halnya saat kita membeli buah jeruk di pasar, penjual akan menggunakan neraca duduk untuk menghitung massa jeruk yang kita beli. Penjual akan <span style="font-weight: bold;">membandingkan massa jeruk</span> <span style="font-weight: bold;">dengan massa anak beban</span> yang ada. Misalnya, kita mau beli 1 kg jeruk, maka penjual akan menggunakan anak beban yang massanya juga 1 kg. Nah, <span style="font-weight: bold;">anak beban inilah yang digunakan sebagai</span> <span style="font-weight: bold;">standar</span> ketika menghitung massa suatu benda (dalam hal ini yaitu buah jeruk).</span></span></p>
<p style="text-align: justify; font-weight: bold;"><span style="background-color: transparent;"><span style="color: #000000;">Baca juga: <a href="/blog/konsep-reaksi-reduksi-oksidasi-kimia-kelas-10" rel="noopener">Mempelajari Konsep Reaksi Redoks (Reduksi-Oksidasi)</a></span></span></p>
<p style="text-align: justify; font-weight: bold;"> </p>
<h2 style="text-align: justify; font-weight: bold; font-size: 20px;"><span style="background-color: transparent;"><span style="color: #000000;">Rumus dan Cara Menghitung Massa Atom Relatif (Ar)</span></span></h2>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Lalu, kalau menghitung <span style="font-weight: bold;">massa atom relatif (Ar)</span>, standarnya apa nih?</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Berdasarkan IUPAC (<em>International Union of Pure and Applied Chemistry</em>), atom yang digunakan sebagai <span style="font-weight: bold;">standar</span> penentuan massa atom relatif adalah <span style="font-weight: bold;">atom karbon (C-12)</span>.</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Kamu bisa melihat <span style="font-weight: bold;">rumus massa atom relatif </span><span style="font-weight: normal;">alias </span><span style="font-weight: bold;">rumus Ar</span> pada gambar berikut.</span></span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/Rumus%20Massa%20Atom%20Relatif%20(Ar).jpg" alt="Rumus Massa Atom Relatif (Ar)" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></span></span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Kenapa atom C-12 yang dijadikan standar? Atom C-12 digunakan sebagai standar atau pembanding untuk menentukan suatu unsur, karena atom C-12 memiliki <span style="font-weight: bold;">isotop yang paling banyak terdapat di alam dan paling stabil</span>. <span style="font-weight: bold;">Isotop adalah</span> atom yang memiliki nomor atom sama, tetapi nomor massanya berbeda. Contohnya yaitu isotop C-12 dan C-13.</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Atom karbon C-12 memiliki massa sebesar <span style="font-weight: bold;">12</span> <span style="font-weight: bold;">satuan massa atom</span> bisa ditulis <span style="font-weight: bold;">12</span> <span style="font-weight: bold;">sma</span> atau <span style="font-weight: bold;">12</span> <span style="font-weight: bold;">amu (<em>atomic mass unit</em>)</span>. Dalam satuan kg, massa atom karbon C-12 adalah sebesar <span style="font-weight: bold;">20,04 x 10<sup>-27</sup> kg</span>. </span></span><span style="background-color: transparent;"><span style="color: #000000;">Karena atom C-12 ini digunakan sebagai standar, maka <span style="font-weight: bold;">satu satuan massa atom</span> didefinisikan sebagai suatu massa yang besarnya <span style="font-weight: bold;">tepat sama dengan seperdua belas massa satu atom C-12</span>.</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Nah, seperti sudah dibahas di infografik tadi, massa 1 atom hidrogen adalah <span style="font-weight: bold;">1,67 x 10<sup>-27</sup> kg</span>, alias 1/12 dari massa atom C-12. Maka dalam satuan sma, massa 1 atom <span style="font-weight: bold;">hidrogen</span> dapat dianggap sama dengan <span style="font-weight: bold;">1 sma</span>.</span></span><span style="background-color: transparent;"><span style="color: #000000;"></span></span></p>
<p style="text-align: center;"><span style="background-color: transparent;"><span style="color: #000000;">—</span></span></p>
<p style="text-align: center;"><em><span style="background-color: transparent;"><span style="color: #000000;">Gimana? Pusing, ya? Kalau kamu bingung dan ada pertanyaan, langsung aja tanyain ke RoboguruPlus! Pertanyaan kamu akan dijawab oleh Tutor yang ahli pada bidangnya masing-masing, lho. Yuk, tanya sekarang!</span></span></em></p>
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<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="background-color: transparent;">Sekarang, kita lanjut lagi, ya!</span></span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;"><span style="background-color: transparent;">Kalau kamu perhatikan rumus Ar tadi, untuk menghitung Ar atau massa atom relatif, kita harus menghitung <span style="font-weight: bold;">massa rata-rata dari 1 atom unsur</span> yang mau kita hitung. </span></span></span><span style="background-color: transparent;"><span style="color: #000000;">Kenapa kita harus <span style="font-weight: normal;">menentukan massa atom rata-rata</span> dari setiap unsur? </span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Jadi, <span style="font-weight: bold;">atom-atom unsur yang sama, tidak selalu mempunyai massa yang sama</span>. Kita bisa menganalogikannya dengan massa butiran beras. Meskipun dari jenis beras yang sama, tapi antara satu butir beras dengan butiran beras lainnya, massanya tidak persis sama. Ada yang lebih berat sedikit, ada yang lebih ringan sedikit. Nggak akan sama persis massanya. Nah, sama halnya dengan atom–atom unsur. Meskipun berasal dari unsur yang sama, tapi massanya berbeda-beda. Inilah yang kita kenal sebagai <span style="font-weight: bold;">isotop</span>.</span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Misalnya, <span style="font-weight: bold;">atom karbon</span> ada yang mempunyai massa <span style="font-weight: bold;">12 sma</span> dan <span style="font-weight: bold;">13 sma</span>. Dengan adanya isotop tersebut, maka massa atom rata-rata dari atom karbon adalah <span style="font-weight: bold;">rata-rata massa atom dari keseluruhan isotop stabil atom yang ada di alam</span>. </span></span></p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Sedangkan, isotop yang tidak stabil atau <span style="font-weight: bold;">radioisotop</span> yaitu isotop yang bersifat <span style="font-weight: bold;">radioaktif</span><span style="font-weight: normal;">.</span> Radioisotop <span style="font-weight: bold;">tidak dipertimbangkan dalam penentuan massa atom rata-rata</span>, karena dapat dengan cepat meluruh menjadi unsur lain.</span></span></p>
<p style="text-align: justify; font-weight: bold;"><span style="background-color: transparent;"><span style="color: #000000;">Baca juga: <a href="/blog/bentuk-molekul-dan-definisinya" rel="noopener">Bentuk Molekul berdasarkan Teori Domain Elektron dan Teori Hibridisasi</a></span></span></p>
<p style="text-align: justify; font-weight: bold;"> </p>
<p style="text-align: justify;"><span style="background-color: transparent;"><span style="color: #000000;">Untuk menghitung <span style="font-weight: bold;">massa atom rata-rata dari suatu unsur X</span>, dapat dirumuskan dengan:</span></span></p>
<p style="text-align: justify;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/rumus%20massa%20rata%20rata%201%20atom%20unsur%20x.png" alt="rumus massa rata rata 1 atom unsur x" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></p>
<p style="text-align: justify;"><span style="color: #000000; background-color: transparent; font-weight: bold;">Keterangan:</span></p>
<p style="text-align: justify;"><span style="color: #000000;">% isotop 1 = kelimpahan isotop pertama</span></p>
<p style="text-align: justify;"><span style="color: #000000;">% isotop 2 = kelimpahan isotop kedua</span></p>
<p style="text-align: justify;"><span style="color: #000000;">massa isotop 1 = massa atom isotop pertama</span></p>
<p style="text-align: justify;"><span style="color: #000000;">massa isotop 2 = massa atom isotop kedua</span></p>
<p style="text-align: justify;"><span style="color: #000000;">dan seterusnya (</span><span style="color: #000000;">jika ada <span style="font-weight: bold;">lebih dari 2 isotop</span>, maka bisa menggunakan perkalian yang sama dengan isotop pertama dan kedua).<br /></span></p>
<p style="text-align: justify;"><span style="color: #000000;">Oke, biar pemahaman kamu jadi lebih mantap, kita langsung aplikasikan aja ke latihan soal, ya!</span></p>
<p style="text-align: justify;"> </p>
<p style="text-align: justify; font-weight: bold; font-size: 20px;"><span style="color: #000000;">Contoh Soal</span></p>
<p style="text-align: justify;"><span style="color: #000000;">Atom klorin (Cl) di alam tersedia dalam dua macam isotop, yaitu 75% sebagai Cl-35 yang bermassa 35 sma dan 25% sebagai Cl-37 yang bermassa 37 sma. Hitunglah massa atom relatifnya!</span></p>
<p style="text-align: justify; font-weight: bold;"><span style="color: #000000;">Penyelesaian:</span></p>
<p style="text-align: justify; font-weight: normal;"><span style="color: #000000;">Pertama-tama, kita hitung <span style="font-weight: bold;">massa rata-rata 1 atom unsur klorin</span> terlebih dahulu menggunakan rumus seperti berikut.</span></p>
<p style="text-align: justify;"><span style="color: #000000;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/massa%20rata%20rata%201%20atom%20unsur%20cl.png" alt="massa rata rata 1 atom unsur cl" width="600" loading="lazy" style="width: 600px; margin-left: auto; margin-right: auto; display: block;"></span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="background-color: transparent;">Lalu, setelah mengetahui massa atom rata-rata </span></span><span style="color: #000000;"><span style="background-color: transparent;">dari unsur klorin, selanjutnya kita hitung <span style="font-weight: bold;">massa atom relatifnya</span> menggunakan <span style="font-weight: bold;">rumus Ar</span> seperti berikut.</span></span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="background-color: transparent;"><img decoding="async" src="https://cdn-web.ruangguru.com/landing-pages/assets/hs/massa%20atom%20relatif%20ar%20cl.png" alt="massa atom relatif ar cl" width="300" loading="lazy" style="width: 300px; margin-left: auto; margin-right: auto; display: block;"></span></span></p>
<p style="text-align: justify;"><span style="color: #000000;"><span style="background-color: transparent;">Jadi, massa atom relatif atau Ar dari klorin tersebut adalah sebesar <span style="font-weight: bold;">0,355</span>. <em>Eits</em> ingat, menulisnya <span style="font-weight: bold;">tanpa satuan</span> ya, karena seperti tadi sudah kita bahas, massa atom relatif tidak mempunyai satuan.</span></span></p>
<p style="text-align: justify;"><span style="color: #000000;">Gimana, <em>guys</em>? Sudah paham kan tentang massa atom relatif? Biar makin mahir dalam menghitung massa atom relatif, kamu harus memperbanyak latihan soal, ya. Kalau kamu mau belajar <a href="/blog/tag/kimia-x" rel="noopener"><span style="font-weight: bold;">materi Kimia kelas 10 lainnya</span></a>, kamu bisa lho membaca artikel-artikel lain di <span style="font-weight: bold;">ruangbaca</span> dan menonton video belajar beranimasi di <a href="https://ruangguru.onelink.me/blPk/eaff0eb9" rel="noopener" target="_blank"><span style="font-weight: bold;">ruangbelajar</span></a>! Yuk, tingkatkan terus kemampuan belajarmu bersama Ruangguru!</span></p>
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<p style="text-align: left; font-weight: bold;"><span style="color: #000000;">Sumber Gambar:</span></p>
<p style="text-align: left;"><span style="color: #000000;">Gambar ‘Atom’ [Daring]. Tautan: https://www.radiologycafe.com/wp-content/uploads/2021/04/science-atom.png (Diakses: 9 Juni 2022)</span></p>
<p style="text-align: left;"> </p>
<p style="font-weight: bold; text-align: justify;"><em><span style="color: #000000;">Artikel ini pertama kali ditulis oleh Fahri Abdillah dan telah diperbarui oleh Kenya Swawikanti pada 14 Juni 2022.</span></em></p>
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Latar Belakang Terjadinya Konflik Palestina dengan Israel | Sejarah Kelas 12 </h2>
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<span>March 5, 2026</span> <span>• 5 minutes read</span>
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<img src="https://cdn-web-2.ruangguru.com/static/facebook.png" loading="lazy" alt="Logo Facebook Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://twitter.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/twitter.png" loading=" lazy" alt="Logo Twitter Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.youtube.com/ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/youtube.png" loading=" lazy" alt="Logo Youtube Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.linkedin.com/company/ruangguru-com">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/linkedin.png" loading=" lazy" alt="Logo LinkedIn Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.tiktok.com/@ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/tiktok.png" loading=" lazy" alt="Logo TikTok Footer" width="32px" height="32px" />
</picture>
</a>
</nav>
</div>
<div class="col-lg-9">
<div class="row">
<div class="col-6 col-md-3">
<nav class="footer-menu">
<p class="title">Produk Ruangguru</p>
<ul type="none">
<li><a href="https://roboguru.ruangguru.com" target="_blank">Roboguru</a></li>
<li><a href="https://www.ruangguru.com/roboguruplus">Roboguru Plus</a></li>
<li><a href="https://www.ruangguru.com/dafa-lulu">Dafa dan Lulu</a></li>
<li><a href="https://www.ruangguru.com/for-kids/kursus">Kursus for Kids</a></li>
<li><a href="https://www.ruangguru.com/for-kids">Ruangguru for Kids</a></li>
<li><a href="https://www.ruangguru.com/bisnis">Ruangguru for Business</a></li>
<li><a href="https://www.ruangguru.com/ruanguji">Ruanguji</a></li>
<li><a href="https://www.ruangguru.com/blog">Ruangbaca</a></li>
<li><a href="https://www.ruangguru.com/ruangkelas">Ruangkelas</a></li>
<li><a href="https://www.ruangguru.com/ruangbelajar">Ruangbelajar</a></li>
<li><a href="https://pengajar.ruangguru.com/">Ruangpengajar</a></li>
<li><a href="https://www.ruangguru.com/privat">Ruangguru Privat</a></li>
<li><a href="https://www.ruangpeduli.org/" target="_blank">Ruangpeduli</a></li>
</ul>
</nav>
</div>
<div class="col-6 col-md-3">
<nav class="footer-menu">
<p class="title">Bantuan & Panduan</p>
<ul type="none">
<li><a href="https://www.ruangguru.com/company-credentials">Company Credentials</a></li>
<li><a href="https://www.ruangguru.com/beasiswa">Beasiswa Ruangguru</a></li>
<li><a href="https://www.ruangguru.com/cicilan">Cicilan Ruangguru</a></li>
<li><a href="https://www.ruangguru.com/promo">Promo Ruangguru</a></li>
<li><a href="https://ticketing.ruangguru.com/help?request_type_id=459" target="_blank">Vulnerability Report</a></li>
<li><a href="https://www.ruangguru.com/bantuan#layanan">Layanan Pengaduan</a></li>
<li><a href="https://www.ruangguru.com/terms-conditions">Syarat & Ketentuan</a></li>
<li><a href="https://www.ruangguru.com/privacy-policy">Kebijakan Privasi</a></li>
<li><a href="https://www.ruangguru.com/about-us">Tentang Kami</a></li>
<li><a href="https://www.ruangguru.com/contact-us">Kontak Kami</a></li>
<li><a href="https://www.ruangguru.com/press">Press Kit</a></li>
<li><a href="https://www.ruangguru.com/bantuan">Bantuan</a></li>
<li><a href="https://career.ruangguru.com/">Karier</a></li>
</ul>
</nav>
</div>
<div class="col-6 col-md-3">
<nav class="footer-menu">
<p class="title">Produk Lainnya</p>
<ul type="none">
<li><a href="https://www.brainacademy.id/" target="_blank">Brain Academy</a></li>
<li><a href="https://www.english-academy.id/" target="_blank">English Academy</a></li>
<li><a href="https://skillacademy.com/" target="_blank">Skill Academy</a></li>
<li><a href="https://www.ruangkerja.id/" target="_blank">Ruangkerja</a></li>
<li><a href="https://www.schoters.com/id/" target="_blank">Schoters</a></li>
<li><a href="https://www.kalananti.id/" target="_blank">Kalananti</a></li>
</ul>
</nav>
</div>
<div class="col-6 col-md-3">
<nav class="footer-menu">
<p class="title"> Coba GRATIS Aplikasi Ruangguru</p>
<div class="download-list">
<ul>
<li>
<a target="_blank" rel="nofollow" href="https://apps.apple.com/id/app/ruangguru-solusi-belajar/id1099742206?l=id">
<img src="https://cdn-web-2.ruangguru.com/static/appstore.png" loading="lazy" alt="Button App Store Footer " />
</a>
</li>
<li>
<a target="_blank" rel="nofollow" href="https://play.google.com/store/apps/details?id=com.ruangguru.livestudents&hl=in">
<img src="https://cdn-web-2.ruangguru.com/static/googleplay.png" loading="lazy" alt="Button Google Play Footer " />
</a>
</li>
<li>
<a target="_blank" rel="nofollow" href="https://appgallery.huawei.com/#/app/C102352375">
<img src="https://cdn-web-2.ruangguru.com/static/huawei.png" loading="lazy" alt="Button AppGallery Footer " />
</a>
</li>
</ul>
</div>
</nav>
</div>
</div>
</div>
</div>
<div class="d-lg-none text-center">
<nav class="footer-menu social">
<p class="title">Ikuti Kami</p>
<a target="_blank" href="https://www.instagram.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/instagram.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/instagram.png" loading="lazy" alt="Logo Instagram Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.facebook.com/ruanggurucom/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/facebook.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/facebook.png" loading="lazy" alt="Logo Facebook Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://twitter.com/ruangguru/">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/twitter.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/twitter.png" loading=" lazy" alt="Logo Twitter Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.youtube.com/ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/youtube.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/youtube.png" loading=" lazy" alt="Logo Youtube Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.linkedin.com/company/ruangguru-com">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/linkedin.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/linkedin.png" loading=" lazy" alt="Logo LinkedIn Footer" width="32px" height="32px" />
</picture>
</a>
<a target="_blank" href="https://www.tiktok.com/@ruangguru">
<picture>
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60&convert=webp" type="image/webp">
<source srcset="https://cdn-web-2.ruangguru.com/static/tiktok.png?height=60" type="image/png">
<img src="https://cdn-web-2.ruangguru.com/static/tiktok.png" loading=" lazy" alt="Logo TikTok Footer" width="32px" height="32px" />
</picture>
</a>
</nav>
</div>
<p class="footer-copyright">
© 2026 All Rights Reserved PT. Ruang Raya Indonesia
</p>
</div>
<style>
.bantuan-container {
position: relative;
}
.bantuan-element {
position: fixed;
z-index: 999;
display: flex;
align-items: flex-end;
justify-content: flex-end;
cursor: pointer;
transition: all 0.6s ease;
}
.bantuan-top {
bottom: 11rem;
right: 2rem;
}
.bantuan-bottom {
bottom: 2rem;
right: 2rem;
}
.bantuan-top-2 {
bottom: 15rem;
right: 2rem;
}
.bantuan-top-3 {
bottom: 19rem;
right: 2rem;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 2rem;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 2rem;
}
@media (min-width: 768px) {
.bantuan-element img {
width: auto;
transition: all 0.4s ease;
}
.bantuan-top img {
width: 140px;
}
.bantuan-bottom img {
width: 140px;
}
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 140px;
}
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 140px;
}
.bantuan-element.clicked {
bottom: 9rem;
right: 2.5rem;
}
.bantuan-element.clicked img {
width: auto;
height: 64px;
}
}
@media (max-width: 767px) {
.bantuan-top {
bottom: 8rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom {
bottom: 2rem;
right: 1.25rem;
align-items: center;
}
.bantuan-top-2 {
bottom: 12rem;
right: 1rem;
align-items: center;
}
.bantuan-top-3 {
bottom: 16rem;
right: 1rem;
align-items: center;
}
.bantuan-bottom-2 {
bottom: 5rem;
right: 1.25rem;
align-items: center;
}
.bantuan-bottom-3 {
bottom: 8rem;
right: 1.25rem;
align-items: center;
}
.bantuan-element img {
width: auto;
}
.bantuan-top img,
.bantuan-top-2 img,
.bantuan-top-3 img {
width: 96px;
}
.bantuan-bottom img,
.bantuan-bottom-2 img,
.bantuan-bottom-3 img {
width: 96px;
}
}
.bantuan-element:hover {
transform: scale(1.05);
}
.bantuan-element img {
max-width: 100%;
height: auto;
}
</style>
<div id="bantuan-divs-container" style="position: relative" data-product="ruangguru" data-table="rg_floating_icon"></div>
<script>
class FloatingDivsComponent {
constructor(product = 'ruangguru', table = 'rg_floating_icon') {
this.container = document.getElementById('bantuan-divs-container');
this.floatingElements = [];
this.product = product;
this.table = table;
// Configuration
this.config = {
baseApiUrl: 'https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/rg_banner/views/',
apiKey: 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
maxElements: 2,
zIndexBase: 100,
};
// Build dynamic API URL based on table parameter
this.config.apiUrl = this.buildApiUrl();
this.init();
}
buildApiUrl() {
const baseUrl = this.config.baseApiUrl;
const tableName = this.table || 'rg_floating_icon';
const queryParams =
'offset=0&limit=99999&sort=rankPosition&where=(type,eq,floating)~and(showIn,anyof,blog)~and(hide,is,false)~and(product,eq,' +
this.product +
')&nested%5Bcta%5D%5Bfields%5D=Id,name,ctaId,imageUrl,ctaLink,targetUrl';
return `${baseUrl}${tableName}?${queryParams}`;
}
async init() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to initialize floating divs component:', error);
}
}
async fetchFloatingElements() {
try {
const options = {
method: 'GET',
headers: {
'xc-token': this.config.apiKey || 'vLyK3dJrDBRmOwueX2OJXibMkgsUbBk0WS4ua2p1',
},
};
const urlNoco = this.config.apiUrl;
const response = await fetch(urlNoco, options);
if (!response.ok) {
throw new Error(`HTTP error! status: ${response.status}`);
}
const data = await response.json();
this.floatingElements = this.processApiResponse(data);
} catch (error) {
console.error('Error fetching floating elements:', error);
throw error;
}
}
processApiResponse(data) {
if (!data || !data.list || !Array.isArray(data.list)) {
return [];
}
console.log(data.list);
// Ensure we only get maximum 2 elements
const limitedElements = data.list.slice(0, this.config.maxElements);
return limitedElements;
}
renderFloatingElements() {
if (!this.container || this.floatingElements.length === 0) {
return;
}
// Additional safeguard: ensure we never render more than maxElements
const elementsToRender = this.floatingElements.slice(0, this.config.maxElements);
// Clean up existing elements and their event listeners
this.cleanupExistingElements();
// Clear existing content
this.container.innerHTML = '';
elementsToRender.forEach((element, index) => {
const floatingDiv = this.createFloatingDiv(element, index);
this.container.appendChild(floatingDiv);
});
}
cleanupExistingElements() {
// Clear existing elements (no need for event listener cleanup with CSS approach)
const existingElements = this.container.querySelectorAll('[data-floating-element]');
existingElements.forEach(element => {
element.remove();
});
}
createFloatingDiv(element, index) {
const div = document.createElement('div');
const cta = element.cta[0]; // Use the first CTA
// Add data attribute for cleanup tracking
div.setAttribute('data-floating-element', 'true');
// Apply CSS classes based on rankPosition
const positionClass = this.getPositionClass(element.rankPosition, index);
div.className = `bantuan-element ${positionClass}`;
div.style.zIndex = this.config.zIndexBase + index;
// Create the link and image
const link = document.createElement('a');
link.href = 'https://cta.ruangguru.com/' + cta.ctaId || '#';
link.target = '_blank';
// Add tracking attributes
link.setAttribute('data-tracking-event-type', 'landing_page__core__item_click');
link.setAttribute(
'data-tracking-context',
JSON.stringify({
product_name: this.product,
cta_action: 'redirection',
cta_action_detail: link.href,
item_type: 'floating',
item_name: element.name || 'Floating element',
item_category: 'payment',
item_position: index,
item_serial: null,
section_type: 'floating_item',
section_position: 'body',
section_name: 'floating_item',
})
);
const img = document.createElement('img');
img.src = element.imageUrl + '?h=200&convert=webp';
img.alt = element.name || 'Floating element';
img.loading = 'lazy';
// Add click tracking
link.addEventListener('click', () => {
this.trackClick(element, cta);
});
link.appendChild(img);
div.appendChild(link);
return div;
}
getPositionClass(rankPosition, index) {
// Define positioning classes based on rankPosition
if (rankPosition === 1) {
return 'bantuan-top'; // Top position
} else if (rankPosition === 2) {
return 'bantuan-bottom'; // Bottom position
} else {
// For additional elements, distribute them evenly
return `bantuan-${index % 2 === 0 ? 'top' : 'bottom'}-${Math.floor(index / 2) + 1}`;
}
}
trackClick(element, cta) {
// Implement click tracking logic here
console.log('Floating element clicked:', {
elementId: element.Id,
elementName: cta.name,
ctaId: cta.ctaId,
targetUrl: cta.targetUrl,
});
}
// Public method to manually refresh
async refresh() {
try {
await this.fetchFloatingElements();
this.renderFloatingElements();
} catch (error) {
console.error('Failed to refresh floating elements:', error);
throw error;
}
}
// Public method to get current floating elements
getFloatingElements() {
return [...this.floatingElements];
}
}
// Initialize the component when DOM is ready
document.addEventListener('DOMContentLoaded', () => {
// Get product and table parameters from data attributes
const container = document.getElementById('bantuan-divs-container');
const product = container.getAttribute('data-product') || 'ruangguru';
const table = container.getAttribute('data-table') || 'rg_floating_icon';
new FloatingDivsComponent(product, table);
});
// Export for use in other modules if needed
if (typeof module !== 'undefined' && module.exports) {
module.exports = FloatingDivsComponent;
}
</script> <div id="wp-install-nudge" style="
position: fixed;
bottom: 0rem;
right: 0;
z-index: 999;
cursor: pointer;
"></div>
<script>
(function (w, d, s, o, f, js, fjs) {
w['Sales-Nudge-Widget'] = o; w[o] = w[o] || function () { (w[o].q = w[o].q || []).push(arguments) };
js = d.createElement(s), fjs = d.getElementsByTagName(s)[0];
js.id = o; js.src = f; js.async = 1; fjs.parentNode.insertBefore(js, fjs);
}(window, document, 'script', 'wpInstallNudge', 'https://cdn-web-2.ruangguru.com/sales-nudge/6198a95130/dist/widget.js'));
wpInstallNudge('init', { targetElementId: 'wp-install-nudge', clientTarget: 'ruangguru_blog' });
</script>
<script>
// note: disabled due to auto reload page
// var lastScrollTop = 0;
// $(window).scroll(function(event){
// var st = $(this).scrollTop();
// if (st > lastScrollTop){
// $('#wp-install-nudge').slideDown( "slow", function() {});
// } else {
// $('#wp-install-nudge').slideUp( "slow", function() {});
// }
// lastScrollTop = st;
// });
// $(document).ready(function () {
// $("#wp-install-nudge").hide();
// });
$('#wp-install-nudge').click(function(){
Analytics.track("promotion__install_nudge__click",
{
user_email: "ruangguru@blog.com",
cta_link: widgetData.dataConfig.target_link
}).catch((err) => {
console.log("tracker error", err);
});
});
</script>
</footer>
<div id="__next"></div>
<script type="speculationrules">
{"prefetch":[{"source":"document","where":{"and":[{"href_matches":"\/blog\/*"},{"not":{"href_matches":["\/blog\/wp-*.php","\/blog\/wp-admin\/*","\/blog\/wp-content\/uploads\/*","\/blog\/wp-content\/*","\/blog\/wp-content\/plugins\/*","\/blog\/wp-content\/themes\/ruangguru\/*","\/blog\/*\\?(.+)"]}},{"not":{"selector_matches":"a[rel~=\"nofollow\"]"}},{"not":{"selector_matches":".no-prefetch, .no-prefetch a"}}]},"eagerness":"conservative"}]}
</script>
<script>
async function getCtaDetails(ctaIds) {
const endpoint =
" https://gw.ruangguru.com/api/v3/rdb/p_ddgy8hjx5dxsqx/CTA/views/CTA?offset=0&limit=10&where=(ctaId,in," + ctaIds.toString() + ")";
try {
const response = await fetch(endpoint, {
headers: {
"xc-token": "-hG2nBDJzSj0agSgNtcJx97M4F02y54nUMoY6plJ",
},
});
const data = await response.json();
const ctaList = data?.list || [];
const ctaMap = new Map();
for (const ctaData of ctaList) {
ctaMap.set(ctaData.ctaId, ctaData);
}
return ctaMap;
} catch (error) {
console.error("Error fetching CTA details:", error);
return new Map();
}
}
async function replaceCTA() {
const regex = /{{cta\((‘(.*?)’|“(.*?)”)\)}}/g;
const bodyHTML = document.body.innerHTML;
const matches = Array.from(bodyHTML.matchAll(regex));
const ctaIds = matches.map((match) => {
let ctaId = match[2] ?? match[3];
return ctaId;
});
const ctaMap = await getCtaDetails(ctaIds);
const replacedHTML = bodyHTML.replace(regex, (match, _inner, ctaId1, ctaId2) => {
const ctaId = ctaId1 ?? ctaId2;
const ctaData = ctaMap.get(ctaId);
if (ctaData) {
return `<a href="https://cta.ruangguru.com/${ctaData.ctaId}" target="_${ctaData.targetType}" style="position:relative;display:inline-block;">
<img src="${ctaData.imageUrl}" loading="lazy" alt="${ctaData.altText}" />
</a>`;
} else {
return match;
}
});
document.body.innerHTML = replacedHTML;
}
</script>
<meta name="author" content="Ruangguru Tech Team">
<!-- Google Tag Manager (noscript) -->
<noscript><iframe src="https://www.googletagmanager.com/ns.html?id=GTM-PVNLZFT" height="0" width="0" style="display:none;visibility:hidden"></iframe></noscript>
<!-- Tracker -->
<script type="text/javascript" src="https://cdn-web-2.ruangguru.com/landing-page-web/public/staticpages/global-assets/js/cta.js"></script>
<script src="https://unpkg.com/@dotlottie/player-component@latest/dist/dotlottie-player.mjs" type="module"></script>
</body>
</html>