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Avogadro's number |
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Avogadro's number (ävōgä`drō) [for Amedeo Avogadro Avogadro, Amedeo, conte di Quaregna (ämādā`ō kôn`tā dē kwärā`nyä ..... 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 6.02×1023 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, 6.02252×1023. 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. Avogadro's numberNumber of units in one mole of any substance (defined as its molecular weight in grams), equal to 6.0221367 × 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 also Avogadro's law; law of mass action; stoichiometry. Avogadro's number [¦a·və¦gäd·drōz ‚nəm·bər] (physics) The number (6.02 × 1023) of molecules in a gram-molecular weight of a substance. How to thank TFD for its existence? Tell a friend about us, add a link to this page, add the site to iGoogle, or visit webmaster's page for free fun content. |
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| b], the equivalent molar fluorescence can be directly converted to the average MESF units per particle by multiplying by Avogadro's Number and dividing by the number concentration of particles in the measured suspension. Currently, Avogadro's number is rooted in the exact number of atoms present in 12 grams of the isotope carbon-12. In classical physics applications, in statistical mechanics--that is, the theory of gases--it can go to three times Avogadro's number, the number of atoms in a gram-mole of an element or compound, Alder says. |
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