Stoichiometric coefficient is a term used in chemistry that refers to the numerical value that relates to the number of molecules or atoms involved in a chemical reaction. Synonyms for this word include mole ratio, reaction coefficient, and coefficient of stoichiometry. The mole ratio of a chemical reaction refers to the ratio of moles of one substance to another in a balanced equation. the reaction coefficient indicates the number of moles of a substance that participates in a reaction, while the coefficient of stoichiometry specifies the numerical value that relates to the amounts of substances used or produced during a chemical reaction. All of these terms are important in understanding chemical reactions and their underlying principles.