- 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
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.
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