4.3.5 Use of amount of substance in relation to volumes of gases

Question 1

What is the relationship between moles of gases and volume under the same conditions?

Answer 1

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

Question 2

What is the volume of one mole of any gas at room temperature and pressure?

Answer 2

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

Question 3

How can the volumes of gaseous reactants and products be calculated?

Answer 3

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

Question 4

What should students be able to calculate regarding gases?

Answer 4

Students should be able to calculate the volume of a gas at room temperature and pressure from its mass and relative formula mass.

Question 5

What is another calculation students should be able to perform?

Answer 5

Students should be able to calculate volumes of gaseous reactants and products from a balanced equation and a given volume of a gaseous reactant or product.

Question 6

What mathematical skill should students develop?

Answer 6

Students should be able to change the subject of a mathematical equation.