This key facts covers Key Facts to Memorise within Gas Volume for GCSE Chemistry. Topic 19: Gas Volume It is section 6 of 11 in this topic. Use this key facts to connect the idea to the wider topic before moving on to questions and flashcards.
📌 Key Facts to Memorise
- Molar gas volume at RTP = 24 dm³/mol (or 24,000 cm³/mol)
- RTP = Room Temperature and Pressure (20°C, 1 atm)
- Volume = moles × 24 (when volume in dm³)
- Moles = volume ÷ 24
- Applies to ALL gases — H₂, O₂, CO₂, N₂, etc.
- 1 dm³ = 1000 cm³ — convert if needed!
- Combine with n = m ÷ Mr for mass-to-volume calculations
Practice questions for Gas Volume
What is the molar gas volume at RTP (room temperature and pressure)?
Explain why the molar gas volume of 24 dm³/mol is only valid at RTP.
Quick recall flashcards
What is the molar gas volume at RTP?
24 dm³/mol (or 24,000 cm³/mol)
One mole of ANY gas occupies 24 dm³ at room temperature and pressure
How do you convert cm³ to dm³?
Divide by 1000
1 dm³ = 1000 cm³
Example: 2400 cm³ = 2.4 dm³