According to the mechanism below, what is the correct expression for the rate of

Question

According to the mechanism below, what is the correct expression for the rate of consumption of A? In the mechanism, M is a molecule that collides with A and A* is a highly-energized form of A.


Step 1 (reversible): A + M <---> A* + M rate constants k1 and k-1

Step 2 (irreversible): A* ---> C rate constant k2

(a) Rate = [C] / [A]
(b) Rate=k1+k2-k-1-k-2
(c) Rate=k1k2 / (k-1+k-2)
(d) Rate = k1k2 [A] [M] / k-1
(e) Rate = k1k2 [A] / (k-1+k2[M])
(f) Rate = [A] / [C]
(g) Rate = k1k2 [A]
(h) Rate = k1[A]
(i) Rate = k1 [A] [M] / (k-1[M] + k2)
(j) Rate = (k1 [A] [M] + k-2[C] ) / (k-1[M] + k2)
(k) Rate = k1k2 [A] [M] / (k-1[M] + k2)
(l) Rate = (k1+k2-k-1-k-2) [A]

Explanation / Answer

ANS (a)
solution below
k1=[A* ] [M]/[A ] [M] 1
k2=[C]/[A*] 2

[A*]=[C]/k2
putting this value in 1
k1=([C]/k2)[M]/[A ] [M]
k1=[C]/k2[A]
k1k2=[C]/[A]

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