Molar Volumes of Gases

Molar Volumes of Gases

Definition: Molar volume of gases

One mole of gas occupies \(\text{22.4}\) \(\text{dm$^{3}$}\) at standard temperature and pressure.

This applies to any gas that is at standard temperature and pressure. In grade 11 you will learn more about this and the gas laws.

Fact:

Standard temperature and pressure (S.T.P.) is defined as a temperature of \(\text{273.15}\) \(\text{K}\) and a pressure of \(\text{0.986}\) \(\text{atm}\).

For example, \(\text{2}\) \(\text{mol}\) of \(\text{H}_{2}\) gas will occupy a volume of \(\text{44.8}\) \(\text{dm$^{3}$}\) at standard temperature and pressure (S.T.P.). and \(\text{67.2}\) \(\text{dm$^{3}$}\) of ammonia gas (\(\text{NH}_{3}\)) contains \(\text{3}\) \(\text{mol}\) of ammonia.

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