Chemistry - Chemical Kinetics Question with Solution | TestHub

The given rate law is $r=k[{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I}]$.

The order of a reaction is the sum of the powers of the concentration terms in the rate law. Since the power of $[{\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I}]$ is $1$, the order of the reaction is $1$.

Molecularity is the number of reactant molecules taking part in an elementary reaction. In the given reaction, only one molecule of ${\mathrm{C}}_2{\mathrm{H}}_5\mathrm{I}$ is involved as the reactant. Therefore, the molecularity of the reaction is $1$.

Hence, both the order and molecularity of the reaction are $1$.

Answer: order and molecularity both are 1