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) N=(4.7*2.3)/(.0821*305.15) .432 moles (Reference: Chang 5.31) 1
5. What volume will 5.6 moles of sulfur hexafluoride (SF 6 ) gas occupy if the temperature and pressure of the gas are 128°C and 9.4 atm? (8 points) V=(5.6*.0821*401.15)/9.4 19.6l (Reference: Chang 5.33) 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) 2.5*1.2*298.15=V*.003*250.15 1193L (Reference: Chang 5.35) 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) (Reference: Chang 5.47) a) 2..21 g/l b) 54.46 g/mol 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?

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