Question

Mention the molar volume of a gas (ideal) at STP.

Answer 1

Molar volume is the volume occupied by 1 mol of any (ideal) gas at standard temperature and pressure (STP: 1 Atmospheric pressure, $0^{0}C$).
Ideal gas equation is = PV = nRT
Where, n= no. of moles = 1
R = Universal gas constant = 8.314 ${\mathrm{mol}}^{-1}{K}^{-1}$Standard T= 273k
Standard Pressure = 1 atm = $1.013\times {10}^5{\mathrm{Nm}}^{-2}$
V = $\frac{\mathrm{nRT}}{P}$
V = $\frac{1\times 8.314\times 273}{1.013\times {10}^5}$

V = 0.0224 $m^3$
V = 22.4 litres
Hence, the molar volume of a gas at STP is 22.4 litres.