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gas laws

# gas laws - 7 Calculate the pressure exerted by 1.00 mol of...

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Problem Set: Gas Laws CHE103 Dr. Moran 1. What volume will be occupied by a sample of hydrogen at 1.51 atm if the volume at 740 mmHg is 223 mL (constant temp)? 2. Halothane is a gas used in anesthesia in hospitals. Its density is 0.857 g/L at 23 ºC and 80.2 torr. What would be its density at STP? 3. A sample of a gas occupied 0.400 L at STP. What volume will it occupy at 740 torr and 87 ºC? 4. A mixture of B 2 H 6 (3.28 mmol) and PF 3 (19.21 mmol) was collected in a vessel whose capacity was 62.5 mL. What was the expected total pressure at 25 ºC? 5. What is the amount (moles) and weight (g) of NO 2 Cl (g) that is required to fill a 500 mL flask at 0.500 atm at 25 ºC? 6. Predict the volume of oxygen that would be produced by the decomposition of 1.25 g KClO 3 according to the reaction equation: 2 KClO 3 (s) 2 KCl (s) + 3 O 2 (g) The oxygen is collected at 30 ºC at a pressure of 718 mmHg.
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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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