What is the volume of 1 mole of gas at 0¬° Celsius and 1 atm?
Using the ideal gas law gives
This result is the volume of 1 mole of any gas under STP conditions and is called the standard molar volume.
Example:
A certain gas exerts a pressure of .75atm on a 15L container. The top of the container is attached to a piston so that it can move to accommodate changes in volume. If the gas is initially 30¬° Celsius and is then cooled to -10¬° Celsius, what is the new volume of the container?