13.2 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.
Given:
n = Number of moles = 1
At STP,
T = Standard temperature = 273 K
P = Standard pressure = 1 atm = 1.013 × 105 Nm-2
The ideal gas equation is:
PV = nRT
Where R = 8.314 J mol-1k-1
V=nRTP
=1×8.314×2731.013×105
= 0.0224 m3
= 22.4 litres
Hence, the molar volume of an ideal gas at STP is 22.4 litres.
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