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Mole Concept and Mole Conversions We have a score of items meaning 20. Then there is the dozen to mean 12 items. The mole identifies a very large number of items. The mole is a unit that is defined as 6.023 X 1023 particles. It is also equal to the formula mass of a substance expressed in grams. For example: 1 mole of H2O = 6.023 X 1023 molecules of H2O = 18 grams H2O This statement establishes the relationship between mole units and molecule units and the relationship between mole units and gram units. The following are examples as to how the mole concept is applied: Mole to gram conversion ยท &nbs
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submitted by srujana (3220 m) on 30 May 2007 12:42:02 IST (6 comments 538 views)
Mole concept: The mole is defined as the amount of a substance containing as many atoms, molecules, ions, electrons or other elementry entities as there are carbon atoms in exactly 12 g of 12C. NA = 6.022 X 1023 The following are the definitions of 'mole' represented in the form of equations: (1) no. of moles of molecules/atoms = weight in g
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submitted by coolank2 (128 m) on 30 Aug 2007 18:43:22 IST (4 comments 389 views)
Previous iit-jee mole concept questions Assignment Level-I 1) . a) Calculate the mass of 5 gram atoms of calcium. Atomic mass of alcium is 40. b) Calculate the mass of 1.5 gram molecules of water. 2) Calculate the number of gram atoms and gram molecules in 25.4 mg of iodine (12). Atomic mass of I = 127 amu. 3) How much sulphuric acid (H2SO4) can be obtained from 5 kg of pure sulphur (S8). 4) What is the molar volume of water at 273 K. Density of water = 1.00 gm/ cm^3. 5)
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submitted by sravan (183 m) on 14 May 2007 10:07:42 IST (0 comments 96 views)
