Chemistry Assignment Help with Molecularity

4.2 Molecularity

A chemical reaction that takes place in one and only one step i.e., all that occurs in a single step is called elementary reaction while a chemical reaction occurring in the sequence of two or more steps is called complicated reaction. The sequence of steps through which a complicated reaction takes place is called reaction – mechanism. Each step in a mechanism is an elementary step reaction.

The molecularity of an elementary reaction is defined as the minimum number of molecules, atoms or ions of the reactants(s) required for the reaction to occur and is equal to the sum of the stoichiometric coefficient of the reactants in the chemical equation of the reaction. Thus, the molecularity of some elementary reactions are as mentioned below.

Elementary reaction Molecularity

PCl5 PCl3 + Cl2 1

H2 + I2 2HI 1 + 1 = 2

Reactions with molecularity equal to one, two, three etc., are called unimolecular, bimolecular, termolecular, etc., respectively.

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