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| 1. |
Define mole.... |
| Answer» The mole is the unit of measurement for amount of substance in the International System of Units<br>Sowndu se<br>Nhi meri baat nhi hoti seraj, Smarkakee se<br>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 | |