Levine, Ira N. Department of Chemistry, Brooklyn College, Brooklyn, New York.
Last reviewed:June 2015
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The number of elementary entities in one mole of a substance. A mole is defined as an amount of a substance that contains as many elementary entities as there are atoms in exactly 12 g of 12C; the elementary entities must be specified and may be atoms, molecules, ions, electrons, other particles, or specified groups of such particles. Experiments give (6.022140857 ± 0.000000074) × 1023 as the value of the Avogadro number. In most calculations the coefficient is rounded off to 6.02. Thus, a mole of 12C atoms has 6.02 × 1023 carbon atoms, a mole of water molecules contains 6.02 × 1023 H2O molecules, a mole of electrons contains 6.02 × 1023 electrons, and so forth. See also: Mole (chemistry)
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