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The number of entities (symbol N) in a one-mole sample equals the Avogadro number (symbol ), a dimensionless quantity. The Avogadro constant (symbol ) is given by the Avogadro number multiplied by the unit reciprocal mole (mol^-1), i.e. 1={{math = math|N₀}}/mol}}. The ratio is a measure of the amount of substance (with the unit mole).The

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