2 4 Molecularity
of a
Reaction
Another property of a reaction called molecularity helps in
understanding its mechanism The number of reacting species
(atoms, ions or molecules) taking part in an elementary
reaction, which must collide simultaneously in order to bring
about a chemical reaction is called molecularity of a reaction The reaction can be unimolecular when one reacting species is involved,
for example, decomposition of ammonium nitrite