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Avogadro's Number Definition - Avogadro's Number is the number of atoms or molecules that are contained in a unit mole of a substance. Since this... Avogadro's Number Definition - Avogadro's Number is the number of atoms or molecules that are contained in a unit mole of a substance. Since this value remains constant for all the elements, it is also known as Avogadro constant. It is generally represented as the number of particles that are contained in one mole.
AVOGADRO'S NUMBER A principle stated in 1811 by the Italian chemist Amadeo Avogadro (1776-1856) that equal volumes of gases at the same temperature and pressure contain the same number of molecules regardless of their chemical nature and physical properties. This number (Avogadro's number) is 6.023 X 10 23. It is the number of molecules of any gas present in a volume of 22.41 L and is the same for the lightest gas (hydrogen) as for a heavy gas such as carbon dioxide or bromine. Avogadro's number is one of the fundamental constants of chemistry.