Calculations involving gas volumes
2 marks · NormalCalculate the volume, in dm³, of 0.25 moles of nitrogen gas, N₂, at room temperature and pressure (rtp).
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6 dm³ (±0.1)
Also accept: 6.0 dm³
Common mistakes: multiplying by 24 000 instead of 24; using incorrect units
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Marking points
M1 · 1 mark · States or uses the correct molar volume at rtp (24 dm³ per mole)
A1 · 1 mark · Correct answer: 6 dm³, with unit
Worked solution
At rtp, 1 mole of any gas occupies 24 dm³.