What is Molar Volume?
At standard Temperature and Pressure (STP) the molar volumeĀ (Vm) is the volume occupied by one mole of a chemical element or a chemical compound.Ā It can be calculated by dividing the molar mass (M) by mass density (Ļ). Molar gas volume is one mole of any gas at a specific temperature and pressure has a fixed volume.
Molar Volume Formula
The Molar volume is directly proportional to molar mass and inversely proportional to density. The formula of the molar volume is expressed as
Where Vm is the volume of the substance.
The standard temperature used is 273 Kelvin or 0oC,
Standard pressure is 1 atmosphere, i.e., 760 mm Hg.
Experimentally, one mole of any gas occupies a volume of 22.4 litres at STP. The equation can be expressed as
1 mole of gas at STP = 22.4 litres of gas.
Example 1
Calculate molar volume for a sample of the molar mass of the N2Ā if the density of the gas isĀ 1.250 g/L?
Solution:
The molar mass of Nitrogen = 28.01 g/mol
Vm = (28.01)/(1.250)
Vm = 22.408 L
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