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Define mole.... |
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Answer» The mole is the unit of measurement for amount of substance in the International System of Units Sowndu se Nhi meri baat nhi hoti seraj, Smarkakee se Mole ConceptTerm mole was suggested by Ostwald (Latin word mole = heap)A mole is defined as the amount of substance which contains same number of elementary particles (atoms, molecules or ions) as the number of atoms present in 12 g of carbon (C-12).1 mol = 6.023 * 1023\xa0atoms = one gram-atom = gram atomic mass1 mol = 6.023 * 1023\xa0molecules = gram molecular massIn gaseous state at STP (T = 273 K, p = 1 atm)Gram molecular mass = 1 mol= 22.4 L = 6.022 * 1023\xa0moleculesStandard number 6.023x 1023\xa0is called Avogadro number in honour of Avogadro (he did not give this number) and is denoted by NA.The volume occupied by one mole molecules of a gaseous substance is called molar volume or gram molecular volume.Number of moles = amount of substance (in gram) / molar mass |
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