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When temperature and pressure of a gas are 273.15 K (or 0°C) and 1 atm
(or 1 bar or 10 pascal), such conditions are called standard temperature and pressure conditions (STP). Under these conditions, the volume
occupied by 1 mole of each and every gas is 22.4 L. Hence, the molar volume of N and Ar at 273.15 K and 1 atm is 22,4 L.