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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.
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.
Since chemical reactions can neither create nor destroy matter, nor transmute one element into another, the amount of each element must be the same throughout the overall reaction.
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.