Sebanyak 12 gram gas hidrogen (H₂) dibakar dengan oksigen (O₂) menghasilkan air sebanyak 108 gram. Oksigen yang diperlukan dalam reaksi ini adalah 96 gram.
Penjelasan dengan langkah-langkah:
Salah satu hukum dasar kimia adalah Hukum Kekekalan Massa (Lavoisier), berikut bunyi hukum tersebut.
"Di dalam suatu reaksi kimia, massa zat-zat sebelum reaksi sama dengan massa zat-zat sesudah reaksi".
Berikut ini adalah persamaan reaksi yang diberikan (reaksi sudah setara).
[tex]2H_2(g) + O_2(g) \to 2H_2O(l)[/tex]
- Massa zat-zat sebelum reaksi: massa gas hidrogen + massa gas oksigen = 12 gram + x gram
- Massa zat-zat sesudah reaksi: massa air = 108 gram
12 + x = 108
x = 108 - 12
x = 96
Jadi, massa gas oksigen yang diperlukan dalam reaksi ini adalah 96 gram.
-----------------------
Catatan
Dari hukum kekekalan massa di atas, dapat dinyatakan bahwa massa dapat berubah bentuk tetapi tidak dapat diciptakan atau dimusnahkan. Jika suatu persamaan reaksi berlangsung dalam suatu sistem tertutup, maka massa dari pereaksi (reaktan) harus sama dengan massa hasil reaksi (produk).
Contoh lain dari hukum kekekalan massa (Lavoisier) adalah sebagai berikut.
Pada reaksi antara logam Mg sebanyak 8 gram dengan 4 gram oksigen sesuai persamaan reaksi: [tex]2Mg(s) +O_2(g) \to 2MgO(s)[/tex], dihasilkan 12 gram magnesium oksida.
Pelajari lebih lanjut
Pelajari materi tentang lima hukum dasar kimia melalui pranala https://brainly.co.id/tugas/10307896
#BelajarBersamaBrainly
#SPJ4
[answer.2.content]![B. inggris Sekolah Menengah Atas A. Underline the subject once and the verb twice! (Score 50) <br />[1] English is the most commonly spoken language in the world. <br />[2] One out of five people can speak or at least understand English. <br />[3] Nowadays more people are dedicating time to study English. <br />[4] For several years many countries are starting to learn English at a younger age. <br />[5] Knowing English increases your chances of getting a good job in a company. <br />[6] In the last century, the number of scientific papers is written in English. <br />[7] In today's world, multilingualism is becoming more and more important.<br />[8] Being able to speak English helps to make a real connection with other people. <br />[9] From the latest information English is the official language in 53 countries. <br />[10] Many films, TV shows, books and music are published and produced in English..<br />](https://1.bp.blogspot.com/-FxxoZkxtk_U/WKAvV2Gd6iI/AAAAAAAACd0/UTrLC-1x23k1E0oqRLErM2XliW2XDiBlQCK4B/s1600/dif.jpg "B. inggris Sekolah Menengah Atas A. Underline the subject once and the verb twice! (Score 50) <br />[1] English is the most commonly spoken language in the world. <br />[2] One out of five people can speak or at least understand English. <br />[3] Nowadays more people are dedicating time to study English. <br />[4] For several years many countries are starting to learn English at a younger age. <br />[5] Knowing English increases your chances of getting a good job in a company. <br />[6] In the last century, the number of scientific papers is written in English. <br />[7] In today's world, multilingualism is becoming more and more important.<br />[8] Being able to speak English helps to make a real connection with other people. <br />[9] From the latest information English is the official language in 53 countries. <br />[10] Many films, TV shows, books and music are published and produced in English..<br />")
