Chemistry and Chemical Reactivity (9th Edition)

Published by Cengage Learning
ISBN 10: 1133949649
ISBN 13: 978-1-13394-964-0

Chapter 14 Chemical Kinetics: The Rates of Chemical Reactions - Study Questions - Page 553f: 59

Answer

2

Work Step by Step

It can't be mechanism 1 because the rate for the elementary step would be $r=k[CO][NO_2]$ Mechanism 3 would have the rate be $r=k[NO_2]$, which is the rate for the elementary slow step. Mechanism 2 has the rate of the slow, rate-determining step, equal to $r=k[NO_2]^2$, so this is the one that best agrees with the data.
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