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Pengamatan laju untuk reaksi sesuai persamaan kimia: NO(g) + Br2(g) → NOBr2(g) disajikan pada tabel berikut. Persamaan laju reaksi tersebut yang benar adalah …

Pengamatan laju untuk reaksi sesuai persamaan kimia:
NO(g) + Br2(g) → NOBr2(g)
disajikan pada tabel berikut.
Persamaan laju reaksi tersebut yang benar adalah …
(A) v = k [NO]^2 [Br2] (B) v = k [NO]^2 [Br]^2
(C) v = k [NO] [Br2]^2
(D) v = k [NO] [Br2] (E) v = k [Br2]

Pengamatan laju untuk reaksi sesuai persamaan kimia: NO(g) + Br2(g) → NOBr2(g) disajikan pada tabel berikut. Persamaan laju reaksi tersebut yang benar adalah ...

Jawaban yang benar adalah D.

Laju Reaksi (v)
Laju reaksi adalah laju bertambahnya produk per satuan waktu.

Rumus laju reaksi :
v = k x [A]ᵐ x [B]ⁿ

Ket :
v = laju reaksi (M/s)
k = tetapan laju reaksi
[A] = [B] = konsentrasi reaktan (M)
m = n = orde reaksi

Pembahasan :
Sebelum menentukan persamaan laju reaksi dari percobaan ini, terlebih dahulu tentukan nilai orde reaksi masing-masing reaktan.

1. Orde reaksi NO (bandingkan dengan percobaan yang memiliki [Br2] sama, yaitu 2 dan 3)
(v3 : v2) = (k x [NO]₃ᵐ x [Br2]₃ⁿ) : (k x [NO]₂ᵐ x [Br2]₂ⁿ), karena nilai k3 dan k2 serta [Br2]₃ dan [Br2]₂ sama, maka bisa dicoret
(9,6 M/s : 4,8 M/s) = (0,2 M : 0,1 M)ᵐ
2 = (2)ᵐ
(2)¹ = (2)ᵐ
m = 1

2. Orde reaksi Mr2 (bandingkan dengan percobaan [NO] sama, yaitu 1 dan 2)
(v2 : v1) = (k x [NO]₂ᵐ x [Br2]₂ⁿ) : (k x [NO]₁ᵐ x [Br2]₁ⁿ), karena nilai k2 dan k1 serta [NO]₁ dan [NO]₂ sama, maka bisa dicoret
(4,8 M/s : 2,4 M/s) = (0,2 M : 0,1 M)ⁿ
2 = (2)ⁿ
(2)¹ = (2)ⁿ
n = 1

3. Persamaan laju reaksi
v = k x [NO] x [Br₂]

Jadi, persamaan laju reaksi untuk percobaan ini adalah
(D) v = k x [NO] x [Br₂]

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 17