, the molar volume
of a substance is the volume
of one mole
of that substance. It can be computed as the substance's atomic
weight, divided by its density
. The SI unit
for volume is m3
Thus, the SI unit of molar volume is cubic metres per mole (m3mol-1).
Cubic centimetres (cm3) a measure of volume one million times smaller than a cubic metre, are sometimes also used, to give units of cm3mol-1.
The molar volume is usually given for a solid substance at 298.15 K (temperature of standard state). Apart from temperature and density, it depends on phase and allotrope of the substance.