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Avogadro's law
Avogadro's law states that equal volumes of all gases, measured under the same conditions of temperature and pressure, contain equal numbers of molecules.
Molar mass
Molar mass, denoted as $M$, is the mass of one mole of a substance.
Mole ratio
A mole ratio is the ratio of the amounts (in moles) of reactants and products in a balanced chemical equation. These ratios are determined by the stoichiometric coefficients in the equation.