Question detail
What is the volume of 2 moles of a gas at room temperature and pressure?
Try the question, check the answer, then read the explanation to understand the curriculum point.
At a glance
MCQ
Type
practice
Style
Topic
Use of amount of substance in relation to volumes of gases (chemistry only) (HT only)
Question
- A. 48 dm3
- B. 24 dm3
- C. 12 dm3
- D. 36 dm3
Answer
The correct answer uses the GCSE gas-volume relationship at room temperature and pressure: volume = amount in moles × 24 dm3. This answer should be checked against the named quantitative relationship, the balanced equation where relevant, and the final unit required by the question.
Explanation
At room temperature and pressure, one mole of any gas occupies 24 dm3. To calculate gas volume from amount in moles, multiply the number of moles by 24 dm3. This is not a concentration calculation and it is not a mass-to-moles conversion unless the question first asks you to calculate moles from mass.
Common mistake
Volume Calculation Mistake
Students often forget that one mole of gas occupies 24 dm3 at room temperature and pressure, leading to incorrect volume calculations.
Always remember to use the fact that one mole of any gas at room temperature and pressure occupies 24 dm3 when calculating gas volumes.
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