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1. stoichiometry - (chemistry) the relation between the quantities of substances that take part in a reaction or form a compound (typically a ratio of whole integers).
Molarity, Molality and Normality By Roberta C. Barbalace. The quantitative relationship between chemical substances in a reaction is known as stoichiometry. Avogadro was a pioneer in this field of chemistry. Avogadro hypothesized that there was a specific number that would represent the number of atoms or molecules in a mole of that atom or molecule.