The molecularity of a reaction represents the number of atoms, molecules, or ions that will interfere with each other for the chemical reaction to occur within a limited time frame. The main differences between order and order of reaction are given below.
|The number of ions or molecules that take part in the rate-determining step is known as molecularity.||The sum of powers to which the reactant concentrations are raised in the rate law equation is known as the order of the reaction.|
|It is always a whole number||It can either be a whole number or a fraction|
|The molecularity of the reaction is determined by looking at the reaction mechanism||The order of the reaction is determined by the experimental methods|
|The molecularity of the reaction is obtained by the rate-determining step||The order of the reaction is obtained by the sum of the powers to which the reactant concentrations are raised in the rate law equation|