WEBMay 21, 2024 · The overall order of a reaction can be determined by adding the exponents. For example, if the rate law is Rate = k [A] 2 [B], the order with respect to [A] is 2, the order with respect to [B] is 1, and the overall order for the reaction is equal to 3. The reaction is 2 nd order in [A] and 1 st order in [B].