1. A sample of helium has a volume of 325mL and a pressure of 655mm Hg. What will be the pressure if the helium is compressed to 125mL (T constant)?

2. A 75.0mL sample of oxygen has a pressure of 1.50 atm. What will be the new volume if the pressure becomes 4.50 atm (T constant)?

3. In a weather report, the atmospheric pressure is given as 29.4 inches of mercury. What is the corresponding pressure in mm Hg?

4. A gas with a volume of 525mL at temperature of -25 degrees Celsius is heated to 175 degrees Celsius. What is the new volume of the gas if the pressure and number of moles are held constant?

5. A gas has a volume of 2.8 L at a temperature of 27 degrees celsius. What temperature (degrees Celsius) is needed to expand the volume to 15 L ? (P and n are constant.)

6. Combined gas law problem: A ballon is filled with 500.0 mL of helium at a temperature of 27 degrees celsius and 755 mm Hg. As the ballon rises in the atmosphere, the pressure and temperature drop. What volume will it have when it reaches an altitude where the temperature is -33 degrees celsius and the pressure is 0.65 atm?