QRT Sept 24 - September 25, 2007 Section R02 3: 70, 75, 78,...

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Unformatted text preview: September 25, 2007 Section R02 3: 70, 75, 78, 80 70. How many molecules of this CFC are you releasing to the air when you empty the can? 250 grams CCl 2 F 2 X 1 mole CCl 2 F 2 = 2.0676 mol 120.9135 grams CCl 2 F 2 2.0676 mol X 6.022 x 10 23 molecules = 1.25 x 10 24 molecules 1 mol 75. Calculate the molar mass of each of these compounds and the mass percent of each element. a. PbS, lead (II) sulfide, galena 201.2(1)+ 32.065(1)= 233.265 g/mol % Pb= Mass of Pb in 1 mol PbS x 100% = 201.2 grams Pb x 100% = 86.3% Pb Mass of PbS in 1 mol of PbS 233.265 g PbS % S = Mass of S in 1 mol PbS x 100% = 32.065 grams S x 100% = 13.8% S Mass of PbS in 1 mol of PbS 233.265 g PbS b. C 2 H 6 , ethane, a hydrocarbon fuel 12.0107(2)+ 1.0079(6)= 30.0688 g/mol12....
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QRT Sept 24 - September 25, 2007 Section R02 3: 70, 75, 78,...

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