# Stoichiometry and Gas Law Problem Set Problem Set

This problem set was developed by S.E. Van Bramer for Chemistry 145 at Widener University.

One mole of an ideal gas occupies 22.4 L at 273 K and 1 atmosphere pressure.

1. 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.

2. 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.
1. When the methane is added to the reaction chamber, what is the pressure of methane?
2. When the methane reacts with O2 in the reaction chamber, what pressure of carbon dioxide can be produced.
3. When the methane reacts with O2 in the in the reaction chamber, what pressure of water vapor can be produced.