Avogadro’s number

Avogadro’s number

Avogadro stated that equal volume of all the gases under similar conditions of temperature and pressure contain equal number molecules. This statement is called Avogadro’s hypothesis.

According Avogadro’s law

  • Avogadro’s number: The number of molecules present in a 1g mole of a gas is defined as Avogadro’s number.

NA = 6.023 X 1023 per gram mole

  • At STP or NTP (T = 273 K and p = 1 atm 22.4 L of each gas has 6.023 x 1023 molecules.
  • One mole of any gas at STP occupies 22.4 L of volume.


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