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# In what condition do order and molecularity of a reaction become equal?

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## Order of reaction:The order of the reaction is the connection that exists between the pace of a chemical reaction and the concentration of the species involved. The rate expression of the reaction in the issue must be known before the reaction order can be determined.Molecularity of a reaction:A reaction's molecularity is defined as the number of reacting molecules that collide at the same time to produce a chemical reaction. In other terms, the number of reactant molecules involved in an elementary reaction is defined as its molecularity.Condition for which order and molecularity of a reaction are equal:A reaction must be elementary in order for its order and molecularity to become equal. An elementary reaction is one that happens in a single step.The total of the whole reaction equation is the elementary reaction.Molecularity is derived at each stage in elementary processes.Consider the reaction shown below: $\mathrm{A}+\mathrm{B}\to \mathrm{Products}$ $\mathrm{Rate}\mathrm{equation}={\left[\mathrm{A}\right]}^{1}{\left[\mathrm{B}\right]}^{1}$The order of the reaction is the sum of the coefficient of the rate equation.Therefore, the order of reaction $=2$And molecularity$=2$Thus, for an equal value of order and molecularity, a reaction must be elementary.

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