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(A) $1$. The order of a reaction is the sum of the powers of the concentration terms in the rate law expression. Here, the rate $= k[NO_2]^2$, so the

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The reaction is second order and bimolecular.

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(A) $1$. The order of a reaction is the sum of the powers of the concentration terms in the rate law expression. Here, the rate $= k[NO_2]^2$, so the order is $2$.$2$. The molecularity of an elementary reaction is the number of reacting species (atoms, ions, or molecules) taking part in the reaction. In the reaction $2NO_2(g) \rightarrow 2NO(g) + O_2(g)$, two molecules of $NO_2$ are involved, so the molecularity is $2$.$3$. $A$ reaction with molecularity $2$ is called bimolecular.$4$. Therefore, the reaction is second order and bimolecular.

What is the order and molecularity of the following elementary reaction? $2NO_2(g) \rightarrow 2NO(g) + O_2(g)$, rate $= k[NO_2]^2$

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