Molar volume is the volume occupied by 1 mol of any (ideal) gas at standard temperature and pressure (STP: 1 atmospheric pressure, 0 °C). Show that it is 22.4 litres.
The ideal gas equation relating pressure (P), volume (V), and absolute temperature (T) is given as:
PV = nRT
Where, R is the universal gas constant = 8.314 J mol-1K-1
n = Number of moles = 1
T = Standard temperature = 273 K
P = Standard pressure = 1 atm = 1.013 x 105Nm-2
V = nRT / P
= 1 x 8.314 x 273 / 1.013 x 105
= 0.0224 m3
= 22.4 litres
Therefore, the molar volume of a gas at STP is 22.4 litres
The molar volume of a gas at STP is 22.4 litres.