# 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.

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.