Molar volume
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In chemistry, the molar volume of a substance is the ratio of the moles of a sample of that substance to the amount of substance (usually expressed in moles) in the sample. In order to calculate molar mass, one must divide liters by moles. For a gas, it can be computed as the gas's molecular weight, divided by its density. For non-gaseous substances, it can be computed as the substance's atomic or molecular weight (whichever is appropriate), divided by its density. The SI unit of molar volume is cubic metres per mole (m3mol-1).
For an ideal gas, the standard molar volume is the volume that is occupied by one gram mole of substance (in gaseous form) at standard temperature and pressure (STP) of 273.15 K (H2O freezing temperature) and 101 325 Pa (1 atmosphere). It is 0.022414 m3mol-1 or 22.414 L/mol and is directly related to the universal gas constant R in the ideal gas law.
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.
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Definition of Molesbg:Моларен обем
ca:Volum molar
cs:Molární objem
de:Molares Volumen
es:Volumen molar
fr:Volume molaire
it:Volume molare
lt:Molinis tūris
nl:Molair volume
ja:モル体積
mk:Моларен волумен
pl:Objętość molowa
ro:Volum molar
ru:Молярный объём
sl:Molarna prostornina
sr:Молска запремина
fi:Moolitilavuus
sv:Molvolym
zh:摩尔体积