The reaction is found experimentally to follow the rate law

CHEMISTRY · Single correct · AP · Chemistry · Kinetics · Kinetics

Problem

The reaction

2A+B\rightarrow \text{products}

is found experimentally to follow the rate law

\text{rate} = k[A]^{2}

. Which proposed mechanism is consistent with these data? (a) Step 1 (slow):

A+B\rightarrow C

Step 2 (fast):

C+A\rightarrow \text{products}

(b) Step 1 (slow):

A+A\rightarrow D

Step 2 (fast):

D+B\rightarrow \text{products}

A+B\;\rightleftharpoons\; C

Step 2 (slow):

C+A\rightarrow \text{products}

(d) Single elementary step (slow):

2\,A+B\rightarrow \text{products}