For the proposed mechanism A + X → B k₁,k_-1(fast)
B $\rightarrow$ products k₂ (slow)
What is the rate law?

Question

For the proposed mechanism A + X → B k₁,k_-1(fast) B $\rightarrow$ products k₂ (slow) What is the rate law?

Quizplus · Accepted Answer

The rate law should be in terms of the concentration of reactants and the rate constant. From the given mechanism, the rate-determining step is the slow step, which is the second step. Therefore, the rate law should be proportional to the concentration of A and X raised to their respective coefficients in the balanced equation (1 and 1). The rate law should also include the rate constant for the slow step (k₂). Therefore, the correct rate law is rate = k₂[A][X]. Option E is the only choice that includes this rate law. The other choices either have incorrect coefficients or incorrect rate constants.

For the Proposed Mechanism a + X → B K1,k-1 →\rightarrow→

For the Proposed Mechanism a + X → B K₁,k_{-1 $\rightarrow$}