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# Rate Law and Mechanism

APCHEM-SWEG78

$$2NO \longrightarrow N_2O_2 \text{ (slow)}$$

$$N_2O_2+ O_2 \longrightarrow 2NO_2 \text{ (fast)}$$

For the preceding multi-step reaction mechanism, which of the following is the correct rate law?

A

$\text{rate} = k [N_2O_2]$

B

$\text{rate} = k[N_2O_2][O_2]$

C

$\text{rate} = k[NO]^2$

D

$\text{rate} = k[NO]$