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Law of Conservation of Mass
During a chemical reaction, the total mass of the reactants is always equal to the total mass of the products
a number that is placed in front of the formula of a product or a reactant of a chemical equation to indicate the mole ratio of the reactants and products in a reaction
the exact molar amount of a reactant or a product, as predicted by a balanced chemical equation
the reactant that is completely consumed during a chemical reaction, limiting the amount of product that is produced
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