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Avogadro constant

The Avogadro constant is the exact number of elementary entities in one mole of substance: 6.02214076×10²³ mol⁻¹. Since the 2019 SI revision it is a defining constant with an exact, fixed value, and it is what defines the mole itself. It converts between the atomic scale (atoms, molecules) and the macroscopic scale (grams, liters).

Used in

  • Stoichiometry
  • Molar mass calculations

Source: SI Brochure 9th ed. — exact defining constant