# Avogadro's number

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## Avogadro's number

(ävōgä`drō) [for Amedeo Avogadro**Avogadro, Amedeo, conte di Quaregna**

, 1776–1856, Italian physicist, b. Turin. He became professor of physics at the Univ. of Turin in 1820. In 1811 he advanced the hypothesis, since known as Avogadro's law, that equal volumes of gases under identical conditions of pressure

**.....**Click the link for more information. ], number of particles contained in one mole

**mole,**

in chemistry, a quantity of particles of any type equal to Avogadro's number, or 6.02×10

^{23}particles. One gram-molecular weight of any molecular substance contains exactly one mole of molecules.

**.....**Click the link for more information. of any substance; it is equal to 602,252,000,000,000,000,000,000, or in scientific notation, 6.02252×10

^{23}. For example, 12.011 grams of carbon (one mole of carbon) contains 6.02252×10

^{23}carbon atoms, and 180.16 grams of glucose, C

_{6}H

_{12}O

_{6}, contains 6.02252×10

^{23}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

[¦a·və¦gäd·drōz ‚nəm·bər] (physics)

The number (6.02 × 10

^{23}) of molecules in a gram-molecular weight of a substance.McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.

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