Consider a reaction a G + b H → Products. When concentration of both the reactants G and H is doubled, the rate increases by eight times. However when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled. The overall order of the reaction is

Step-by-step solution

a G + b H → P r o d u c t r a t e ∝ [ G ] a [ H ] b As when concentration of G is doubled keeping the concentration of H fixed, the rate is doubled it means order with respect to G is 1. When concentration of both the reactants G and H is doubled, the rate increases by eight times it means order with respect to H is 2. Hence a = 1 , b = 2 The overall order of reaction = 1 + 2 = 3