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.