Avogadro's number
WordNet

noun


(1)   The number of molecules in a mole of a substance (approximately 602,250,000,000,000,000,000,000)
WiktionaryText

Noun



  1. The number of atoms present in 0.012 kilograms 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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