The rate law is obtained by considering these elementary steps thereby obtaining the correct order of reaction and net reaction equation.
The question is incomplete but I will help as much as I can. The term reaction mechanism refers to the sequence of elementary reactions that yield the desired product(s). We must note that rate of reaction depends on the rate of the slowest reaction in the sequence.
The rate law is obtained by considering these elementary steps thereby obtaining the correct order of reaction and net reaction equation.
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