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Table of molar volume of gases
Tables display the volume that one mole of the selected gas occupies.

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other inorganic

SubstanceMolecular formulaMolar volume [dm3/mol]
ammoniaNH322.08
phosphinePH322.25
argonAr22.38
nitrogenN222.4
heliumHe22.42
kryptonKr22.38
xenonXe22.29
neonNe22.43
ozoneO321.6

gases

SubstanceMolecular formulaMolar volume [dm3/mol]
ammoniaNH322.08
methaneCH422.36
carbon dioxideCO222.26
hydrogen chlorideHCl22.25
hydrogen jodideHI22.1
hydrogen sulfurideH2S22.14
ethene (ethylene)C2H422.24
nitrogen (II) oxideNO22.39
phosphinePH322.25
sulfur (IV) oxideSO221.89
chlorineCl222.02
hydrogenH222.43
oxygenO222.39
nitrogenN222.4
fluorineF222.42
heliumHe22.42
kryptonKr22.38
xenonXe22.29
neonNe22.43
ozoneO321.6

hydrocarbons

SubstanceMolecular formulaMolar volume [dm3/mol]
methaneCH422.36
ethene (ethylene)C2H422.24
benzeneC6H639

oxides

SubstanceMolecular formulaMolar volume [dm3/mol]
carbon dioxideCO222.26
carbon monoxideCO22.4
nitrogen (II) oxideNO22.39
sulfur (IV) oxideSO221.89

hydrides

SubstanceMolecular formulaMolar volume [dm3/mol]
arsenic hydrideAsH322.39

inorganic acids

SubstanceMolecular formulaMolar volume [dm3/mol]
hydrogen bromideHBr22.21
hydrogen chlorideHCl22.25
hydrogen jodideHI22.1
hydrogen sulfurideH2S22.14

liquids

SubstanceMolecular formulaMolar volume [dm3/mol]
benzeneC6H639
chloroformCHCl322.6

other organic

SubstanceMolecular formulaMolar volume [dm3/mol]
chloroformCHCl322.6

halogens

SubstanceMolecular formulaMolar volume [dm3/mol]
chlorineCl222.02
fluorineF222.42

Some facts

  • Molecular volume is the volume occupied by 1 mole of substance i.e. a sample containing about 6,023×10236,023 \times 10^{23} atoms or molecules (→ see Avogadro number).
  • The basic unit of the molar volume in the SI system is cubic meter per mole:
    m3mol\frac{m^3}{mol}
  • The molar volume depends on temperature and pressure. The data given in this calculator refer to normal conditions i.e pressure 1013,25 hPa and temperature 0 °C.
  • The molar volume of perfect gas under normal conditions is 22,415 dm3/mol.
  • The volume of one mole of perfect gas is directly proportional to the temperature and inversely proportional to the pressure:
    Vm=RTpV_m = \frac{RT}{p}
    where:
    • VmV_m - molar volume,
    • R - gas constant,
    • T - temperature,
    • p - pressure.
  • The molar volume of real gases differs from the ideal gas value due to intermolecular interactions.

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