Gas volumes
I can calculate the mass and the volume of a gas reactant/product given a balanced equation.
Gas volumes
I can calculate the mass and the volume of a gas reactant/product given a balanced equation.
Lesson details
Key learning points
- 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℃ and 1 atmosphere pressure) is 24 dm³.
- The volumes of gaseous reactants and products can be calculated from the balanced equation for the reaction.
- If moles of gas are known, its density can be calculated using molar gas volume and the relationship mass = RFM x moles.
Common misconception
Pupils sometimes rush these calculations and forget to take note of the units.
Remind pupils that units provide the comparison standard for values. Much practice ensuring the correct molar gas volume value is used in calculations is necessary.
Keywords
Volume - is how much 3D space matter occupies. It is usually measured in cm³.
Moles - of something is 6.02 × 10²³ of it. The mass of a mole of a substance is its relative mass expressed in grams.
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 - refers to the molar ratio of the reactants and products in a chemical reaction.
Density - is a property of a substance and is its mass divided by its volume.
Equipment
None 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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Starter quiz
6 Questions
Exit quiz
6 Questions
The volume occupied by 1 mole of a gas
Unit for amount of substance
A measure of how much matter is located in a particular volume
How much 3D space matter occupies