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Unformatted text preview: -1 moles of sulfur? 88.5 g Ag 2 S 11. What is the mass percent of xenon in xenon tetrafluoride? 63.338% 12. What is the empirical formula of a compound that has the following mass percentages: C 20.33%, H 8.53%, N 71.14%. CH 5 N 3 13. How many moles of carbon are in 3.54 mol of zinc acetate? 14.2 mol C 14. If you consume 3.5 g of sodium chloride and 4.9 g of sodium bicarbonate, how many total milligrams of sodium did you consume? 2.7 X 10 3 mg Na 15. A gold ore has a mass percent of 0.44 % pure gold. To obtain $200.00 worth of pure gold, how many grams of gold ore do you need? (Cost of gold is $418.00/troy oz, 14.6 troy oz = 454 g of gold) 14.9 g pure gold 3.4 X 10 3 g of gold ore 16. Which is heavier: 0.25 mol of silver atoms or 0.25 mol of platinum atoms? Ag: 107.87 g/mol 0.25 mol X 107.87 g/mol = 3.0 X 10 g Ag Pt: 195.08 g/mol 0.25 mol X 195.08 g/mol = 49 g Pt Platinum is heavier...
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- Spring '09