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The reaction 2NO + Br2 -> 2NOBr is proposed to proceed by the mechanism: (i) NO + Br2 -> NOBr2 (fast equilibrium) (ii) NOBr2 + NO -> 2NOBr (slow) What is the overall order of the reaction?
- 1
- 2
- 3
- 4
Correct answer: 3
Solution
Rate = k[NOBr2][NO]; substituting [NOBr2] = K[NO][Br2] gives rate = k'[NO]²[Br2], an overall order of 3.
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