User:Milton Beychok/Sandbox: Difference between revisions
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== Ideal gases == | == Ideal gases == | ||
The ideal gas equation can be rearranged to give an expression for the molar volume of an ideal gas: | The [[ideal gas law]] equation can be rearranged to give an expression for the molar volume of an ideal gas: | ||
::<math>V_{\rm m} = {V\over{n}} = {{RT}\over{P}}</math>. | ::<math>V_{\rm m} = {V\over{n}} = {{RT}\over{P}}</math>. | ||
== References == | == References == | ||
{{reflist}} | {{reflist}} |
Revision as of 19:05, 10 January 2010
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):
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:
- .