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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).
A mole is a chemical counting unit, such that 1 mole = 6.022 * 10^23 particles. Stoichiometry also requires the use of balanced equations. From the balanced equation we can get the mole ratio. The mole ratio is the ratio of moles of one substance to the moles of another substance in a balanced equation.