Diketahui reaksi tersebut, setelah disetarakan, nilai koefisien reaksi a,b,c, dan d secara berurutan adalah… a K₂Cr₂O7(aq) + 14HCl(aq) →2KCl(aq) + b CrCl3(aq) + c C12(aq) + d H₂O(l)

Diketahui reaksi tersebut, setelah disetarakan, nilai koefisien reaksi a,b,c, dan d secara berurutan adalah… a K₂Cr₂O7(aq) + 14HCl(aq) →2KCl(aq) + b CrCl3(aq) + c C12(aq) + d H₂O(l)
A. 1,2,2,7
B. 1,2.3,7
C. 1,2,1,7
D. 2,1,2,7
E. 2,2,3,7

Jawaban yang benar adalah B

Persamaan reaksi menggambarkan rumus kimia dari zat pereaksi/reaktan dan zat hasil reaksi/produk yang dibatasi oleh tanda panah. Zat pereaksi/reaktan berada di kiri panah, sedangkan zat hasil reaksi/produk berada di kanan panah.

Penyetarakan persamaan reaksi sederhana dapat dilakukan sebagai berikut.
1. Menyetarakan terlebih dahulu unsur logam, non logam, hidrogen (H) dan oksigen (O).
2. Memberi koefisien yang sesuai
Koefisien adalah jumlah satuan rumus kimia yang diletakkan di depan atom atau senyawa untuk menyetarakan reaksi.
𝗣𝗮𝗱𝗮 𝗿𝗲𝗮𝗸𝘀𝗶 𝘀𝗲𝘁𝗮𝗿𝗮, 𝗷𝘂𝗺𝗹𝗮𝗵 𝗮𝘁𝗼𝗺-𝗮𝘁𝗼𝗺 𝗱𝗶 𝗸𝗶𝗿𝗶 𝗱𝗮𝗻 𝗸𝗮𝗻𝗮𝗻 𝗽𝗮𝗻𝗮𝗵 𝗮𝗱𝗮𝗹𝗮𝗵 𝘀𝗮𝗺𝗮

Menyetarakan persamaan reaksi
a K₂Cr₂O₇ (aq) + 14 HCl (aq) → 2 KCl (aq) + b CrCl₃(aq) + c Cl₂ (aq) + d H₂O (l)

Jumlah atom K kiri = Jumlah atom K kanan
2a = 2
𝗮 = 𝟭

Jumlah atom Cr kiri = Jumlah atom Cr kanan
2a = b
2 (1) = b
𝟮 = 𝗯

Jumlah atom Cl kiri = Jumlah atom Cl kanan
14 = 2 + 3b + 2c
14 = 2 + 3(2) + 2c
14 = 8 + 2c
14 – 8 = 2c
6 = 2c
𝟯 = 𝗰

Jumlah atom H kiri = Jumlah atom H kanan
14 = 2d
𝟳 = 𝗱

Jumlah atom O kiri = Jumlah atom O kanan
7a = d
7 (1) = d
𝟳 = 𝗱

Persamaan reaksi setara :
K₂Cr₂O₇ (aq) + 14 HCl (aq) → 2 KCl (aq) + 2 CrCl₃(aq) + 3 Cl₂ (aq) + 7 H₂O (l) (setara)

Jadi, nilai a,b, c, d adalah 1,2,3,7 (B)

Rekomendasi lainnya :

Baca Juga :  Complete the sentences with a form of the verb in parentheses. Three hundred and fifty years ago, people (1. make) /made/ their own clothes. They (2. have, not) _____ machines for making clothes. There (3. be, not) _____ any clothing factories. People (4. tear) _____ homemade clothes that were sewn by hand. Today, very few people (5. make) _____ their own clothes. Clothing (6. come) _____ ready-made from factories. People (7. buy) _____ almost all their clothes from stores. The modern clothing industry (8. be) _____ international. As a result, people from different countries often (9. wear) _____ similar clothes. For example, people in many different countries throughout the world (10. wear) _____ jeans and t-shirts. However, some regional differences in clothing still (11. exist) _____ for instance, people of the Arabian deserts (12. wear) _____ loose, flowing lobes to protect themselves from the heat of the sun. In parts of Northern Europe, fur hats (13. be) _____ common in the winter. In the future, there (14. be, probably) _____ fewer and fewer differences in clothing. People throughout the world (15. wear) _____ clothes from the same factories. (16. We all, dress) _____ in the future? TV shows and movies about the future often (17. show) _____ everybody in a uniform of some kind. What (18. you, think) _____? Number 9
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