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Q.
For a reaction $X + Y \to Z$, rate $\propto [X]$. What is $(i) $ molecularity and $(ii)$ order of reaction?
Chemical Kinetics
Solution:
Molecularity is the number of molecules that come together to react in an elementary (single-step) reaction and is equal to the sum of stoichiometric coefficients of reactants in this elementary reaction.
Two molecules, $X$ and $Y$ are taking part in this reaction so the molecularity of the reaction is $2 .$
Order of reaction is given by the rate law, power of $X$ is 1 in the rate law, so the order of the reaction is $1 .$