stoffmengenbezogenes Volumen
The molar volume, symbol $V_m$, is the volume occupied by one mole of a substance (chemical element or chemical compound) at a given temperature and pressure. It is equal to the molar mass ($M$) divided by the mass density ($\rho$). It has the SI unit cubic metres per mole ($m^{1}/mol$). For ideal gases, the molar volume is given by the ideal gas equation: this is a good approximation for many common gases at standard temperature and pressure. For crystalline solids, the molar volume can be measured by X-ray crystallography.
Applicable units are those of quantitykind:MolarVolume
http://en.wikipedia.org/wiki/Molar_volume
https://cdd.iec.ch/cdd/iec61987/iec61987.nsf/ListsOfUnitsAllVersions/0112-2---62720%23UAD127
http://dbpedia.org/resource/Molar_volume
$V_m = \frac{V}{n}$, where $V$ is volume and $n$ is amount of substance.
http://www.iso.org/iso/catalogue_detail?csnumber=31894