User:Milton Beychok/Sandbox
The molar volume (symbol Vm) is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure.[1] It is equal to the molecular mass (M) divided by the density (ρ) at the given temperature and prerssure:
It has an SI unit of cubic metres per mole (m3/mol).[1] However, molar volumes are often expressed as cubic metres per 1,000 moles (m3/kmol) or cubic decimetres per mol (dm3/mol) for gases and as centimetres per mole (cm3/mol) for liquids and solids.
If a substance is a mixture containing N components, the molar volume is calculated using:
where x i is the mole fraction of the ith component.
Ideal gases
The ideal gas law equation can be rearranged to give an expression for the molar volume of an ideal gas:
- .