| Molecularity | Order |
|---|---|
| Molecularity is the number of reacting species undergoing simultaneous collision in the elementary or simple reaction. | Order is the sum of the powers of the concentration terms in the rate law expression. |
| It is applicable only for elementary reactions. For complex reactions, molecularity has no meaning. | It is applicable to elementary as well as complex reactions. |
| It is a theoretical concept. | It is determined experimentally. |
| It has a whole number values only i.e. 1, 2, 3 etc. It cannot be a non-integer. | It need not be a whole number i.e. it can have fractional values also. |
| Molecularity of a reaction cannot be zero. | Order of a reaction can be zero. |
| For complex reactions, molecularity is given for elementary steps. Molecularity of the slowest step is same as the order of the reaction. | For complex reactions, order is given by slowest step. |
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