Please help me!

Question

1) A gas occupies a volume of 796 mL at a pressure of 127.3 kPa. What is the pressure of the gas when the volume expands to 965 mL?

2) At a pressure of 710 atm, a gas has an unknown volume. When the pressure is decreased to 0.96 atm, the volume is 3700 mL. What was the original volume of the gas?

3) A gas cylinder contains 722L of hydrogen gas at a pressure of 10.6 atm. If the gas is used to fill a balloon at a pressure of 0.96 atm, what is the volume of the filled balloon?

4) A weather balloon has a maximum volume of 7500 L. The balloon contains 195 L of helium gas at a pressure of 0.993 atm. What will be the pressure when the balloon is at maximum volume?

5) A rubber ball contains 0.57 L of gas at a pressure of 1.05 atm. What volume will the gas occupy at 7.47 atm?

Answer 1

Use the ideal gas law, pV = n R T. In these questions n, R, T are constant so pV is constant.

(1)

pV = 796 x 127.3

When V = 965, p = (796 x 127.3 / V ) = (796 x 127.3 / 965) = 105,01 kPa

You can use the same method for the others (make sure the units of pressure / volume are those used un the question)