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Stoichiometry is founded on the law of conservation of mass where the total mass of the reactants equals the total mass of the products leading to the insight that the relations among quantities of reactants and products typically form a ratio of positive integers.
This means that if the amounts of the separate reactants are known, then the amount of the product can be calculated.
Because there are different ways to define the concentration of a component, as a consequence there are also different ways to define the composition of a mixture.
For example it can be expressed as molar fraction, volume fraction, mass fraction, molality, molarity or normality.
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