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The average rate of a reaction is the change in concentration of a reactant or product per unit time. It can be calculated using the following formula:
$Average Rate = rac{[A]_f - [A]_i}{t_f - t_i}$
where $[A]_f$ and $[A]_i$ represent the final and initial concentrations of the reactant or product, and $t_f$ and $t_i$ are the final and initial times.