Chemistry - Chemical Kinetics Question with Solution | TestHub

The given reaction is an elementary reaction: ${\mathrm{O}}_{3(\mathrm{g})}+{\mathrm{O}}_{(\mathrm{g})}\to 2{\mathrm{O}}_{2(\mathrm{g})}$

The rate law is given as $r=k[{\mathrm{O}}_3][\mathrm{O}]$.

The order of a reaction is the sum of the powers of the concentration terms in the rate law equation.

Order $=1+1=2$

The molecularity of an elementary reaction is the number of reactant particles taking part in the reaction.

Since one molecule of ${\mathrm{O}}_3$ and one atom of $\mathrm{O}$ react, the molecularity is $1+1=2$.

Thus, the order is $2$ and the molecularity is $2$.

Answer: $2^{\text{nd }}$ and 2