# 5.E: Gases (Exercises)

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These are homework exercises to accompany the Textmap created for Chemistry: A Molecular Approach by Nivaldo Tro. Complementary General Chemistry question banks can be found for other Textmaps and can be accessed here. In addition to these publicly available questions, access to private problems bank for use in exams and homework is available to faculty only on an individual basis; please contact Delmar Larsen for an account with access permission.

### Q3

I have a special, ideal balloon. This balloon does not exert any pressure on the gas inside it. I start by taking the balloon and inflating it to 4 L in Wilmington DE last night. The weather channel said that the temperature was 45.0 °F, and the pressure was 30.27 inches of Hg.

1. First I take this balloon scuba diving and go down to a depth of 100 ft where the pressure is 7 atm. and the temperature is 54.2 °F. What is the volume of the balloon?
2. Next I take the ballon out to Colorado. In Denver when I arrive at the airport the temperature is 68.4 °F and the barometric pressure is 640 mmHg. Now what size is the balloon?
3. Next on my trip is a hike up to the top of Longs Peak (14,256 ft) where the pressure is 470 torr and the temperature is -20°C. Now what size is the balloon?
4. Finally I take the balloon on the airplane for the trip home and let it out the window. The 747 is flying at 40,000 ft where the pressure is about 80.0 torr and the temperature is -60.0 °C. What is the volume of the balloon here?
5. And last of all the balloon soars up into the stratosphere where the pressure has dropped to 0.8 torr and the temperature is 0°C, what size is it just before it pops?

A 1.0 liter flask at 298 K contains 5000 Pa of nitrogen monoxide and 1000 Pa of oxygen. These will react to form nitrogen dioxide. Use this information to find the pressure of each gas remaining after the reaction is complete and the temperature of the flask has changed to 300 K. 3. Large reaction chambers are often used to study atmospheric reactions. A reaction chamber the size of a small room measures 20x20x12 feet and is thermostated at 20 oC. The reaction chamber is filled with clean air (80% N2, 20% O2) A gas manafold is connected to this chamber. A 1.0 liter lecture cylinder of methane (CH4) has a pressure of 1000 PSI and a temperature of 25 oC. The methane undergoes a chemical reaction in sunlight to produce carbon dioxide and water. a. When the methane is added to the reaction chamber, what is the pressure of methane? b. When the methane reacts with O2 in the reaction chamber, what pressure of carbon dioxide can be produced. c. When the methane reacts with O2 in the in the reaction chamber, what pressure of water vapor can be produced.

5.E: Gases (Exercises) is shared under a CC BY-NC-SA 4.0 license and was authored, remixed, and/or curated by LibreTexts.