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sampled may be specified using a subscript or in parentheses, e.g., the amount of sodium chloride (NaCl) could be denoted as or . Sometimes, the amount of substance is referred to as the chemical amount or, informally, as the "number of moles" in a given sample of matter. The latter term is deprecated by the IUPAC because, for a substance , the correct meaning of "number of moles" is /mol. The amount of substance in a sample can be calculated from measured quantities, such as mass

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