Question

The two-step mechanism shown below has been proposed for thereaction of nitric oxide with bromine:

Step 1: NO(g) + Br₂(g) → NOBr₂(g)

Step 2: NOBr₂(g) + NO(g) → 2 NOBr(g)

a) What is the overall (net) reaction?
b) What is the role of NOBr₂ in this reaction? Explainbriefly.
c) What is the predicted rate law if the first step is much slowerthan the second step? Explain.
d) If the observed rate law is rate = k [NO]² [Br2],what can you conclude about the ratedetermining step? Explain.