The order of a reaction Z1) is the product of the powers to which the reactant concentrations are raised in the rate law. Z2) can’t be greater than two since a ratedetermining step involving the collision of three or more reactants would practically never occur.

Explanation:

The Order of Reaction refers to the power dependence of the rate on the concentration of each reactant.

The overall order of reaction is the sum of the individual orders of reaction with respect to the reactants.

Rate = k [A]²[B]¹

In the rate law above, the rate is second order with respect to A and first order with respect to B. The overall order of reaction is a third order reaaction given as; 2+ 1 = 3

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