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the density of a sample of X is ρ then the molar volume of X is given by ''V''m = ''M''(X)/ρ [m3/mol . The SI unit of molar volume is Cubic Metre s per Mole (m3/mol). It is the reciprocal of amount of substance concentration (moles per volume). For an Ideal Gas , the standard molar volume is the volume that is occupied by one mole of substance (in gaseous form) at Standard Temperature And Pressure (STP) of 273.15 K (0 C ) and 101325 Pa (1 Atmosphere or 760 Torr ). It is '''0.022413 m³mol-1''' or '''22.413 L/mol''' and is directly related to the Universal Gas Constant '''R''' in the Ideal Gas Law . The molar volume for an Ideal Gas at 298.15 K and 1 Bar is 0.024788 m³mol-1 or 24.788 L/mol. Cubic Centimetre s (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. FOOTNOTE SEE ALSO |
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