Question

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.

Answer 1

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^–1 K^–1 

n = Number of moles = 1

T = Standard temperature = 273 K 

P = Standard pressure = 1 atm = 1.013 × 10⁵ Nm^–2 

Hence, the molar volume of a gas at STP is 22.4 litres.