Avogadro-s-number meaning

The number of items in a mole, approximately 6.0221 × 1023 .
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The number of atoms or molecules in a mole of a substance, approximately 6.0225 × 1023 . It is based on the number of carbon atoms in 12 grams of carbon 12.
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(chemistry, physics) The number of atoms present in 12 grams of isotopically pure carbon-12, being 6.0221415 x 1023. By definition, the number of elementary entities (atoms or molecules) comprising one mole of a given substance.
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Origin of avogadro-s-number

Named after Amadeo Avogadro (1776 - 1856)