Converting between mass and volume using moles
I can combine mathematical relationships to calculate an unknown mass or volume.
Converting between mass and volume using moles
I can combine mathematical relationships to calculate an unknown mass or volume.
Lesson details
Key learning points
- The volume of one mole of any gas at room temperature and pressure (20℃ and 1 atmosphere pressure) is 24 dm³.
- Reacting mass calculations can use a combination of mass to volume calculations and vice versa.
- Amount of substance (moles) can be calculated using multiple equations.
- The choice of equation for calculating moles depends on the context of the problem or calculation.
Common misconception
Pupils use an incorrect mathematical relationship to calculate the number of moles in a sample.
Depending on the type of substance (solid, solution or gas) a specific mathematical relationship for moles must be used. Challenge pupils to classify substances as (s), (aq), or (g) and apply correct mathematical relationship.
Keywords
Mole - A mole of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.
Volume - Volume is how much 3D space matter occupies. It is usually measured in cm³.
Molar gas volume - Molar gas volume is the volume occupied by one mole of any gas. It is equal to 24 dm³ or 24 000 cm³ at room temperature and pressure.
Stoichiometry - Stoichiometry refers to the molar ratio of the reactants and products in a chemical reaction.
Balanced symbol equation - A balanced symbol equation describes a reaction using a symbol equation with coefficients, which ensure there are equal numbers of atoms of each element on both sides of the symbol equation.
Equipment
Sample of limestone (calcium carbonate), balance, tongs, heatproof mat, Bunsen burner, tripod, gauze.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
This content is © Oak National Academy Limited (2024), licensed on Open Government Licence version 3.0 except where otherwise stated. See Oak's terms & conditions (Collection 2).
Video
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