# The following two reactions are proposed as elementary steps in the mechanism for an overall reaction: (1) NO2Cl(g)---> NO2(g) + Cl(g) (2) NO2Cl(g) + Cl(g) ---> NO2(g) + Cl2(g) ?

## What is the molecularity of reaction (1)? Type the word. What is the molecularity of reaction (2)? Type the word.

Feb 27, 2018

(1) Unimolecular
(2) Bimolecular

#### Explanation:

$\left(1\right) \text{ " "NO"_2"Cl"(g) -> "NO"_2(g) + "Cl} \left(g\right)$

It has only one molecule on the reactants' side, so it is UNImolecular.

The general unimolecular reactions would be

$\text{A " -> " products}$

$\left(2\right) {\text{ " "NO"_2"Cl"(g) + "Cl"(g) -> "NO"_2(g) + "Cl}}_{2} \left(g\right)$

It has two molecules in the reactants, so it is BImolecular.

The general bimolecular reactions would be

$\text{A " + " B " -> " products}$

or

$\text{2A " -> " products}$