Chapter 15, Problem 11SAQ

The mechanism shown here is proposed for the gas-phase reaction, $2N_2{O}_5\to 4N{O}_2+O_2$ . What rate law does the mechanism predict?
$N_2{O}_5\underset{\underset{k}{\leftharpoondown }}{\overset{k}{\rightharpoonup }}N{O}_2+N{O}_3$    Fast
$N{O}_2+N{O}_3\to N{O}_2+O_2+NO$    Slow
$NO+N_2{O}_5\to 3N{O}_2$    Fast

• rate = K[N₂O₅]
• rate = K[NO₂][NO₃]
• rate = K[N₂O₅]0
• rate = K[N₂O₅]2