Use of amount of substance in relation to volumes of gases

Equal amounts in moles of gases occupy the same volume under the same conditions of temperature and pressure.

The volume of one mole of any gas at room temperature and pressure (20°C and 1 atmosphere pressure) is 24 dm³.

The volumes of gaseous reactants and products can be calculated from the balanced equation for the reaction.

Students should be able to:
- calculate the volume of a gas at room temperature and pressure from its mass and relative formula mass
- calculate volumes of gaseous reactants and products from a balanced equation and a given volume of a gaseous reactant or product
- change the subject of a mathematical equation.