Question

Molecularity of a reaction can be known from:

• A. the stoichiometric equation
• B. the mechanism of the reaction
• C. the order of the reaction
• D. the energy of activation of the reaction

Answer 1

Answer: (B)

the mechanism of the reaction

The molecularity of a reaction is defined as the number of molecules or ions that participate in the rate determining step. It is the number of molecules that come together to react in an elementary reaction and is equal to the sum of stoicheometric coefficients of reactants in this elementary reaction. Depending on how many molecules come together, a reaction can be unimolecular, bimolecular or termolecular.