Answer: stoichiometric

AnswerCrossword Clue
stoichiometricof a chemical formula in which the numbers of atoms are simple integers determined by valency; (of quantities of reactants) present or involved in the simple integral ratios prescribed by an equation or formula
stoichiometricof or pertaining to stoichiometry
stoichiometricpertaining to or involving substances that are in the exact proportions required for a given reaction