If #15 L# of a gas at room temperature exerts a pressure of #5 kPa# on its container, what pressure will the gas exert if the container's volume changes to #12 L#?
If we assume that the temperature does not change, then the product of pressure and volume has to be constant:
It means that the product of initial pressure and volume has to be the same as the final product of pressure and volume.
substituting the numbers
Then the final pressure is