Question

Explain the molar volume of gas.

Answer 1

1. It is more convenient to measure the volume rather than the mass of the gas.
2. It is found from Avogadro law that one mole of any gas occupies a volume of 22.4 dm³ at standard temperature (0 °C) and pressure (1 atm) (STP).
3. The volume of 22.4 dm³ at STP is known as the molar volume of a gas.
4. The relationship between the number of moles and molar volume can be expressed as follows:
   Number of moles of a gas (n) = `"Volume of the gas at STP"/"Molar volume of the gas"`
   = `"Volume of the gas at STP"/(22.4  "dm"^3 "mol"^-1)`