review 6 answers

review 6 answers - -1 moles of sulfur? 88.5 g Ag 2 S 11....

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Dr. Anna Toy-Palmer Chem 100 Chapter 6 review questions: 1. How many moles are in 23.5 g of nitrogen gas? 0.839 moles N 2 2. How many atoms are in 44.3 g of lead? 1.29 X 10 23 atoms 3. Given the following information for a compound: molar mass = 152.111 g/mol, and mass percentages of: C 39.48%, H 2.65%, N 36.83%, O 21.04%, determine the molecular formula. C 5 H 4 N 4 O 2 4. How many oxygen atoms are in 34.5 g of iron (III) hydroxide? 15.5 g O 5. Given the same number of molecules of mercury (I) phosphide and lead (IV) bromide, which has the greater mass? (Hg 2 ) 3 P 2 6. A rock in a lead ore deposit contains 84% PbS by mass. How many kg of the rock must be processed to obtain 1.0 kg of Pb? 1.4 kg lead ore 7. A drop of water is 0.05 mL and has a density of 1.0 g/cm 3 . How many water molecules does it contain? 2 X 10 21 water molecules 8. How many grams of potassium do 7.91 X 10 23 potassium atoms weigh? 51.4 g K 9. How many moles of tin (IV) nitrite produce 3.57 X 10 25 oxygen atoms? 7.41 moles Sn(NO 2 ) 4 10. How many grams of silver sulfide produce 3.57 X 10
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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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review 6 answers - -1 moles of sulfur? 88.5 g Ag 2 S 11....

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