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Mole (mol)

Quantity: Amount of substance · Category: SI base

The mole is the SI base unit of amount of substance. Since 2019 one mole contains exactly 6.02214076×10²³ elementary entities (the Avogadro number) — atoms, molecules, ions or electrons, which must be specified.

Relation to SI

Base unit — 1 mol = 6.02214076×10²³ entities (exact)

Examples

  • One mole of water (18.0 g) contains about 6.02×10²³ molecules.
  • One mole of any ideal gas at standard temperature and pressure occupies about 22.4 L.
  • Chemists weigh 58.5 g of table salt to get one mole of NaCl.