Avogadro’s number

chemistry
Also known as: Avogadro constant
Key People:
Amedeo Avogadro
Joseph Loschmidt

Avogadro’s number, number of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.02214076 × 1023. The units may be electrons, atoms, ions, or molecules, depending on the nature of the substance and the character of the reaction (if any).See alsoAvogadro’s law.

The Editors of Encyclopaedia BritannicaThis article was most recently revised and updated by Erik Gregersen.
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stoichiometry, in chemistry, the determination of the proportions in which elements or compounds react with one another. The rules followed in the determination of stoichiometric relationships are based on the laws of conservation of mass and energy and the law of combining weights or volumes. See also equivalent weight.