Ch3 notes part 1 answers

Ch3 notes part 1 answers - Answers to example questions for...

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Answers to example questions for CH3: Moles, % composition, balancing equations NOTE: Wherever you see an it indicates where you could stop the calculation for an alternative question, and also shows what the answer would be to that alternative question. Calculate the number of moles of Mg atoms, and, number of individual atoms in 4.5 μ g of Mg. 4.5 x 10 -6 g Mg*(1mol Mg / 24.31g Mg)*(6.022 x 10 23 atoms Mg /1 mole Mg) moles of Mg (=1.85 x 10 -7 moles) = 1.11 x 10 17 atoms Mg Calculate the number of moles of molecules and number of individual molecules in 74.6 g of propane, formula C 3 H 8 First, calculate the MW of C 3 H 8 : = (3x12.01g/mol) + (8x1.008g/mol) = 44.094g/mol 74.6g C 3 H 8 * (1mole C 3 H 8 / 44.094g C 3 H 8 )*(6.022 x 10 23 molecules C 3 H 8 /1 mole C 3 H 8 ) moles of C 3 H 8 (1.692 moles) = 1.02 x 10 24 molecules C 3 H 8 Calculate the number of O atoms in 26.5 g of Lithium Carbonate. Lithium Carbonate is Li 2 CO 3 . Calculate FW :
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This note was uploaded on 04/27/2010 for the course CH 301 taught by Professor Fakhreddine/lyon during the Spring '07 term at University of Texas.

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Ch3 notes part 1 answers - Answers to example questions for...

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