Question

Given a mechanism consisting of the following two elementary steps:_______.

Answer 1

Answer:

The reaction is second order in A(g), first order in B(g) and zero order in C(g)

Step-by-step explanation:

A non elementary reaction is a reaction that does not take place in a single reactive encounter. This implies that the reaction occurs in steps as shown in the question above.

C(g) is an intermediate, hence it does not occur in the overall reaction equation. The overall reaction equation is: 2A(g) + B(g) ---> 2D(g)

The rate law of the rate determining step is obtained from;

Rate= k1[A] [B] for fast step

Rate= k2 [A] [C] for slow step

But rate of forward reaction = rate of reverse reaction

k1[A] [B] = k-1 [C]

But [C] =k1 [A] [B]/k-1

Hence

Substitute into

Rate = k2 [A] [C]

Rate = k2k-1[A]^2 [B]/k-1

But k2k-1/k = K

Hence;

Rate = K [A]^2 [B]