This is the number known as Avogadro factor. The Avogadro constant expresses the number of elementary entities per mole of substance.
The Avogadro constant is named after the early nineteenth century Italian scientist Amedeo Avogadro, who, in 1811, first proposed that the volume of a gas (at a given pressure and temperature) is proportional to the number of atoms or molecules regardless of the nature of the gas.
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