Assignment #3 from Chemistry CD ROM
Gas Laws

The following problems are very similar to Chapter 10: Problems 1 to 28 from the CD ROM. Check out how those ones are solved and also read sections 10.1 and 10.3 to 10.7 of the Study Guide and the worked example for gases. E-mail me and/or the class e-mail list if you are having trouble figuring out how to do any of this.


1. For each of the following statements, decide if it is true or false, and explain why as succinctly as possible. (Use your notes and section 10.1 of the CD.)
A) gas molecules are much smaller than molecules of solids or liquids.
B) gases have more molecules per unit of volume.
C) most of a gas sample is empty space.
D) there are very strong attractive forces between the molecules of a gas.

2. A cylinder containing a gas sample has a volume of 40 mL at standard pressure (1.0 atm.). At constant temperature the volume is reduced to 5.0 mL. What is the final pressure of the gas?

3. A tank has a volume of 75 L and the pressure of the gas inside is 1.4 atm at room temperature (20°C). What would the volume of the gas be if the pressure were reduced to 1.0 atm at room temperature?

4. 500. mL of gas at 55.0 °C and one atmosphere are cooled to room temperature at constant pressure. What will the new volume be?

5. A cylinder of nitrogen gas has a total pressure of 900. torr. There is some water in the cylinder and at this temperature the vapor pressure of water is 20. torr. If the volume of the cylinder is reduced by a factor of two at constant temperature, what will the new total pressure be, and what will the new partial pressure of the nitrogen be?

6. A sample of gas at 18.0 °C has a volume of 1.8 L at 1.0 atm. If the volume is changed to 0.20 L while the temperature is changed to -40.0 °C, what will the new pressure of the gas be?

7. A 40.0 mL sample of gas at STP (STP = "standard temperature and pressure" = 0.0 °C and 1.0 atm) is put into a 100. mL container where its pressure is 600. torr. What is the final temperature?

8. If 10 moles of hydrogen gas at 20.0 °C has a volume of 65 L, what is the pressure?

Hosted by www.Geocities.ws

1