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is the mass of each entity of the substance (atomic mass, molecular mass, or formula mass), then the mass of the sample is , and the amount of substance is {{math N(X)/Nsub|A}} =}} N(X)}}}} '· , where is the elementary amount, an amount consisting of exactly one atomic-scale entity of any kind (atom, molecule, formula unit), analogous to the elementary charge . Since the elementary amount is the reciprocal of the Avogadro constant,

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