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Question
What is the difference between the order of a reaction and the molecularity of a reaction?
Solution
| order of a reaction | molecularity of a reaction |
| Order of a reaction is an experimental quantity. It can be zero and even a fraction | Molecularity of a reaction is the number of species (atoms, ions or molecules) taking part in the elementary reaction. It cannot be zero or non-integer |
| The order is applicable to elementary as well as complex reactions. | Molecularity is applicable only for elementary reactions |
| For complex reaction, the order is given by slowest step. |
Molecularity of the slowest step is equal to the order of overall reaction |
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