Unformatted text preview: 7. Calculate the pressure exerted by 1.00 mol of He in a 5.000 L flask at 27 ºC according to the ideal gas law. 8. A gas occupies 345 mL at 33.5 torr at –78 ºC. What is its volume at STP? How many moles of gas are there? 9. A gas exerts a pressure of 652 torr at 0 ºC. At what temperature will it exert a pressure of 184 torr? [ constant amount, constant volume] 10. Calculate the molar mass of a gas if 0.638 g occupies a volume of 223 mL at 23 ºC and 758 torr. 11. If air has a density of 1.293 g/L at STP, what is its density at 15 ºC and 745 torr?  Answers: 1. 144 mL 2. 8.805 g/L 3. 0.542 L 4. 8.80 atm 5. 0.0102 mol ; 0.832 g 6. 403mL 7. 4.92 atm 8. 21.3 mL ; 9.5 ×10 –4 mol 9. 77 K 10. 69.7 g/mol 11. 1.201 g/L...
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 Fall '10
 stafcas
 OC, Halothane

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