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Joined 2026-09-21 Message
Incoming links: Molecularity
Molecularity 2026-10-14
Molecularity counts the reacting entities in one elementary reaction: one for a unimolecular step, two for a bimolecular step. An entity can be a molecule, ion, or chemical atom. Solvent entities involved only through solvation are excluded. Molecularity describes a microscopic event; order of reaction describes the concentration dependence of a rate law. Assigning molecularity to a net multi-step chemical equation is therefore inappropriate.[ref]
Glossary of Terms Used in Physical Organic Chemistry (IUPAC Recommendations 1994): M entries by International Union of Pure and Applied Chemistry. Glossary of Terms Used in Physical Organic Chemistry, IUPAC Recommendations 1994, entry “molecularity”: elementary event and exclusion of solvation medium