Order of Reaction and Molecularity of Reaction:
The following are the points of difference between the order of reaction and molecularity of reaction.
| Order of Reaction | Molecularity of Reaction |
|---|---|
| It is the number of reacting molecules whose concentration actually changes during the reaction. | It is the number of reacting species as indicated by the balanced chemical equation. |
| Order of reaction is an experimental parameter. | Molecularity of a reaction is an assigned parameter. |
| Order of any reaction is obtained from the experimental data. | Molecularity is obtained from the stoichiometric equation. |
| It has factorial values in addition to zero also. | It has whole number values only i.e., 1, 2, 3, 4…… |
| It is used to study the mechanism of the reaction. | It does not convey anything about the mechanism of the reaction. |
| It is the overall order of reaction and not of the separate step used to determine the order of the complex reaction. | The overall molecularity of a complex reaction has no significance. |
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