Chem1A Assignment 5

Chem1A Assignment 5 - 1. Consider the flasks diagramed...

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1. Consider the flasks diagramed below. What are the final partial pressures of H 2 and N 2 after the stopcock between the two flasks is opened? (Assume the final volume is 3.00 L.) P H2 = torr P N2 = torr What is the total pressure (in torr)? torr 2. A sealed balloon is filled with 0.80 L of helium at 23°C and 1.00 atm. The balloon rises to a point in the atmosphere where the pressure is 180 . torr and the temperature is - 29 °C. What is the change in volume of the balloon as it ascends from 1.00 atm to a pressure of 180 . torr? L 3. An ideal gas is contained in a cylinder with a volume of 5.0 10 2 mL at a temperature of 30°C and a pressure of 730 . torr. The gas is then compressed to a volume of 25 mL, and the temperature is raised to 788 .°C. What is the new pressure of the gas? torr 4. A 4.0 L flask contains 0.51 g O 2 at a temperature of 29 °C. What is the pressure (in atm) inside the flask? atm 5. Consider the following chemical equation. 2 NO 2 ( g ) N 2 O 4 ( g ) If 25.0 mL of NO 2 gas is completely converted to N 2 O 4 gas under the same conditions, what volume will the N 2 O 4 occupy? mL 6. A bicycle tire is filled with air to a pressure of 72 psi, at a temperature of 27 °C. Riding the bike on asphalt on a hot day increases the temperature of the tire to 58°C. The volume of the tire increases by 3.5 %. What is the new pressure in the bicycle tire? psi 7. A hot-air balloon is filled with air to a volume of 2.39 10 3 m 3 at 745 torr and 29 °C. The air in the balloon is then heated to 65 °C, causing the balloon to expand to a volume of 5.21 10 3 m 3 . What is the ratio of the number of moles of air in the heated balloon to the original number of moles of air in the balloon? (Hint: Openings in the balloon allow air to flow in and out. Thus the pressure in the balloon is always the same as that of the atmosphere.) (moles of heated air / moles of cool air) 8. A sample of nitrogen gas was collected over water at 20.°C and a total pressure of 1.36 atm. A total volume of
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This note was uploaded on 12/02/2009 for the course CHEM 1A taught by Professor Van koppen during the Spring '07 term at UCSB.

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Chem1A Assignment 5 - 1. Consider the flasks diagramed...

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