4 A sample of nitrogen gas kept in a container of volume 23 L and at a

4 a sample of nitrogen gas kept in a container of

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4. A sample of nitrogen gas kept in a container of volume 2.3 L and at a temperature of 32°C exerts a pressure 4.7 atm. Calculate the number of moles of gas present. (8 points) V=2.3L T=32F=32+273=305K P=4.7atm R= .0821 L atm/K mol PV=nRT N=10.81/25.0405 mol N=.43 mol 5.What volume will 5.6 moles of sulfur hexafluoride (SF6) gas occupy if the temperature and pressure of the gas are 128°C and 9.4 atm? (8 points) 6. A gas-filled balloon having a volume of 2.50 L at 1.2 atm and 25°C is allowed to rise to the stratosphere (about 30 km above the surface of Earth), where the temperature and pressure are –23°C and 3.00 × 10 –3 atm, respectively. Calculate the final volume of the balloon. (8 points) P1V1/T1 = P2V2)/T2 (1.2 atm)(2.50 L) / 298K = (3.00e-3 atm)(V2) / 250K V2 = 838 L 7. A 2.10-L vessel contains 4.65 g of a gas at 1.00 atm and 27.0°C. (a) Calculate the density of the gas in grams per liter. (b) What is the molar mass of the gas? (10 points) T = 27 + 273 = 300 K moles gas = pV/RT = (1.00)(2.10) / (0.08206)(300=0.0853 molar mass = 4.65 g/ 0.0853 mol=54.5 g/mol d = molar mass x p / RT = (54.5)(1.00 / (0.08206)(300=2.21 g/L 2 Copyright © 2014 by Thomas Edison State College. All rights reserved.
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8. A certain anesthetic contains 64.9 percent carbon, 13.5 percent hydrogen, and 21.6 percent oxygen by mass. At 120°C and 750 mmHg, 1.00 L of the gaseous compound weighs 6.90 g. What is the molecular formula of the compound? (10 points) PV=nRT n=PV/RT= (0.987 atm)(1.00 L)/(0.082)(392.3 oK)= 0.0307 moles
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