6. which of the following would be a rate law for the reaction?

Question

The proposed mechanism for a reaction is

1. A(g) + B(g) => X(g) Slow

2. X(g) + C(g) => Y(g) Fast

3. Y(g) => D(g) Fast

Which of the following would be a rate law for the reaction?

Detailed explanation please

The answer is: rate = k[A][B]

Answer 1

The rate law for the reaction is the rate law for the slow step because the slow step is the FIRST step in the proposed mechanism. Any time the slow step is the first step, it will dictate the rate law. Thus, the rate law is

rate = k[A][B]