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Avogadro's number (ävōgä´drō) [for Amedeo Avogadro], number of particles contained in one mole of any substance; it is equal to 602,252,000,000,000,000,000,000, or in scientific notation, 6.02252×1023. For example, 12.011 grams of carbon (one mole of carbon) contains 6.02252×1023 carbon atoms, and 180.16 grams of glucose, C6H12O6, contains 6.02252×1023 molecules of glucose. Avogadro's number is determined by calculating the spacing of the atoms in a crystalline solid through X-ray methods and combining this data with the measured volume of one mole of the solid to obtain the number of molecules per molar volume.

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"Avogadro's number." The Columbia Encyclopedia, 6th ed.. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

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Avogadro constant (Avogadro number) The number of molecules, atoms, or ions in one mole of a substance: 6.02252 × 1023 per mol. It is derived from the number of atoms of the pure isotope 12C in 12 grams of that substance and is the reciprocal of atomic mass in grams.

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"Avogadro constant." A Dictionary of Earth Sciences. . Encyclopedia.com. 10 Dec. 2017 <http://www.encyclopedia.com>.

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"Avogadro constant." A Dictionary of Earth Sciences. . Retrieved December 10, 2017 from Encyclopedia.com: http://www.encyclopedia.com/science/dictionaries-thesauruses-pictures-and-press-releases/avogadro-constant

Avogadro constant(Avogadro number) The number of molecules, atoms, or ions in one mole of a substance: 6.02252 × 1023 per mol. It is derived from the number of atoms of the pure isotope 12C in 12 grams of that substance and is the reciprocal of atomic mass in grams.