The reaction 2NO + Br 2 
2 NOBr takes place through the mechanism given below
NO + Br 2 NOBr 2 (fast)
NOBr 2 + NO 
2 NOBr (slow)
The overall order of the reaction is_____.
Text Solution
Verified by Experts3
(3)
On applying Law of mass action over slowest step,
R = k[NOBr 2 ][NO]
The slowest step is the rate determining step.
On applying Law of mass action on equilibrium of Step I
[NOBr 2 ]=k[NO][Br 2 ]
Hence, overall rate equation will be
R = k[NO] 2 [Br 2 ]
= k'[NO] 2 [Br 2 ]
The overall order is equal to sum of the powers of the concentration terms in the rate law.
The overall order of the reaction is 3.
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