Given the following proposed mechanism,predict the rate law for the overall reaction. A₂ + 2 B → 2 AB (overall reaction)
Mechanism
A₂ ⇌ 2 A fast
A + B → AB slow

Question

Given the following proposed mechanism,predict the rate law for the overall reaction. A₂ + 2 B → 2 AB (overall reaction) Mechanism A₂ ⇌ 2 A fast A + B → AB slow

Quizplus · Accepted Answer

The rate law for the overall reaction is determined by the slow step of the mechanism. In this case, the slow step is A + B → AB, which directly involves one molecule of A and one molecule of B. Since the concentration of A is determined by the equilibrium in the fast step (A₂ ⇌ 2 A), the rate law reflects the dependence on both the precursor A₂ (for the generation of A) and B. Therefore, the rate law is proportional to the concentration of A₂ raised to the power of 1/2 (since it dissociates into 2 A) and the concentration of B.

Given the Following Proposed Mechanism,predict the Rate Law for the Overall