For the overall reaction

CHEMISTRY · Single correct · A Level · Chemistry · Rate equations · Rate equations

Problem

2A + B \rightarrow \text{products}

, the experimentally observed rate law is

r = k[A]^2[B]

. Which proposed mechanism is most consistent with this rate law? (a) None of the proposed mechanisms (A–D) is consistent with the rate law

r = k[A]^2[B]

. (b)

A + 2B \rightarrow \text{products}

(single slow termolecular step) (c)

B + B \rightleftharpoons J

(fast equilibrium)

A + J \rightarrow \text{products}

(slow) (d)

A + B \rightarrow I

(slow)

I + A \rightarrow \text{products}

(fast)