Question

The pressure of 1 mol of gas is decreased to 0.5 atm at 273 K. What happens to the molar volume of the gas under these conditions? The molar volume is halved. The molar volume is doubled. The molar volume is tripled. The molar volume stays same.

Answer 1

In order to determine the effect of the change in temperature, we may apply Boyle's law. Boyle's law states that for a fixed amount of gas at a constant temperature, the pressure of the gas is inversely proportional to its volume.
Mathematically, this is:
PV = constant

Therefore, if the pressure of the gas is halved, the volume of the gas will be doubled.