Using the results of Step $2,$ write the rate law for the overall reaction.

The rate law for the overall reaction is the same as the rate law for the first elementary step in the mechanism because this step is rate$-$limiting$.$ Every other step occurs so fast relative to the first step that only the rate of the first step matters in the overall rate law.

Therefore, the rate law for the overall reaction is the following. $($Rate expressions take the general form: rate $=k*[A{]}^a*[B{]}^b.)$

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