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In other words, it is defined giving the concentration of each component.
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, the number of atoms of a given element X on the reactant side must equal the number of atoms of that element on the product side, whether or not all of those atoms are actually involved in a reaction. i represents the degree to which a chemical species participates in a reaction.For example it can be expressed as molar fraction, volume fraction, mass fraction, molality, molarity or normality.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.Conversely, if one reactant has a known quantity and the quantity of product can be empirically determined, then the amount of the other reactants can also be calculated.