Mole Concept. How to calculate Molar volume of Gases

Avogadro’s law states that equal volumes of molecular gases under the same conditions of
temperature and pressure contain equal numbers of molecules. When we compare the
volumes of gases, we must keep their temperatures and pressures the same. The molar volume
is the volume occupied by 1 mole of gas. The molar volume (Vm) of a gas is the volume that it
occupies at some standard temperature and pressure (STP) or at room temperature and
pressure. The molar volume at STP is 22.4dm3 and at RTP is 24dm3
.
To calculate the volume of a gas at STP or RTP, we use the equation;
V= n x Vm
Where:
n= Moles of gas (mol) conversion of volume units:
V= actual volume of the gas (dm3
) 1000cm3= 1dm3
Vm= Molar volume of the gas 1litre= 1dm3

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