having the precise weight relationship of elements as demanded by the chemical formula, and by which the quantities of reactants and products of a chemical reaction are determined, e.g. TiC (see. stoichiometry; compare: nonstoichiometric composition), olukord, kus elementide vahekord/suhe keemilises ühendis on vastavuses kindlale vahekorrale/suhtele, nt TiC (vt stöhhiomeetria; vrd mittestöhhiomeetriline koostis)