GCSE Chemistry – Gas Calculations – Volume & Moles | Mass, Moles & Mr (2026/27 exams)

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*** WHAT’S COVERED ***
1. The relationship between the volume of a gas, moles, and the molar volume.
* Using the equation: Volume of Gas (dm³) = Moles x 24.
* This calculation applies to any gas at room temperature and pressure (RTP).
2. Calculating the volume of a gas from a known number of moles.
3. Rearranging the equation to calculate the number of moles from a known gas volume.
4. Two-step calculations to find gas volume when given mass.
* First, calculating moles using the mass and relative formula mass (Mr).
* Second, using the moles to calculate the volume.
5. Calculating the volume of a gaseous product from the volume of a gaseous reactant.
* Using molar ratios from a balanced chemical equation.
* A shortcut for converting directly between gas volumes using the molar ratio.
6. The conditions under which the molar volume of a gas is 24 dm³.

*** EXAM BOARD SPECIFIC INFO ***
AQA – Separate science and higher tier only
IGCSE Edexcel – Separate science and higher tier only
Edexcel – Separate science and higher tier only
OCR 21st Century – Separate science and higher tier only
OCR Gateway – Separate science and higher tier only

*** CHAPTERS ***
0:00 Introduction
0:43 Calculating Volume from Moles
0:57 Calculating Moles from Volume
1:24 Two-step Calculations Involving Mass
2:38 Calculating Reacting Gas Volumes
5:57 Importance of Room Temperature and Pressure (RTP)

*** PLAYLISTS ***

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