What is the order and molecularity of the following elementary reaction?
$2 NO_{2 (g)} \to 2 NO_{(g)} + O_{2 (g)}$ , rate $= k \times [NO_{2}]^{2}$

Question

What is the order and molecularity of the following elementary reaction? 2 NO 2 ( g ) ​ → 2 NO ( g ) ​ + O 2 ( g ) ​ , rate = k × [ NO 2 ​ ] 2

TestHub · Accepted Answer

For an elementary reaction, the rate law is determined by its stoichiometry.

Given rate $= k [NO_{2}]^{2}$

The order of the reaction is the sum of the exponents of the concentration terms in the rate law. Here, the exponent is $2$ , so the order is $2$ .

The molecularity of an elementary reaction is the number of reactant molecules participating in the reaction. Since $2$ molecules of $NO_{2}$ are reacting, the molecularity is $2$ (bimolecular).

Thus, the reaction is second order and bimolecular.

Answer: The reaction is second order and biomolecular.

Chemistry - Chemical Kinetics Question with Solution | TestHub

Options:

Doubts & Discussion