Order | Molecularity |
It represents the sum of the exponents to which the concentration terms in the rate equation are raised. | It represents the number of reactant molecules that participate in elementary reaction. |
It is an experimentally determined quantity. | It is theoretical property. |
It can be zero, fraction or integer. | It cannot be zero or fraction. It is an integer. |
Experimental conditions may change order. | Experimental conditions cannot change molecularity. |
It is property of elementary as well as complex reactions. | It is property of elementary reactions only. It makes no sense for complex reactions. |