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Chemistry vocabulary · Moles and Stoichiometry

Avogadro's number

Meaning in chemistry, with examples

nounCommon term

In chemistry, Avogadro's number means: The number of particles in one mole of a substance, about 6.022 × 10²³. Strictly speaking, the Avogadro constant has the unit per mole (mol⁻¹).

In Turkish: Avogadro sayısı, Avogadro sabiti

How it is used

Used to convert between moles and numbers of atoms, ions or molecules. Its symbol is N_A. Since 2019 its value has been fixed at exactly 6.02214076 × 10²³ mol⁻¹, and this number defines the mole.

Example sentences

  1. Multiply the number of moles by Avogadro's number to get the number of molecules.

  2. One mole of carbon-12 contains Avogadro's number of atoms and has a mass of about 12 g.

Common collocations

  • Avogadro constant
  • multiply by Avogadro's number
  • number of particles
  • moleThe SI unit for amount of substance. One of these units contains about 6.022 × 10²³ particles, which lets chemists count atoms and molecules by weighing them.
  • molar massThe mass of one mole of a substance, usually given in grams per mole (g/mol). For water it is about 18.02 g/mol.
  • stoichiometryThe calculation of the amounts of reactants and products in a reaction, using the mole ratios from the balanced equation.

More terms: Moles and Stoichiometry

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