Calculating the volume of a certain number of moles
2 marks · EasyExplain why 2 moles of argon gas at rtp have twice the volume of 1 mole of argon gas at rtp. Use your knowledge of molar volume in your answer.
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Common mistakes: References to molar mass or element-specific properties rather than general molar volume
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Marking points
B1 · 1 mark · States that 1 mole of any gas occupies the same volume at rtp (24 dm³).
B2 · 1 mark · Explains that doubling the number of moles doubles the volume (e.g., 1 mole = 24 dm³ so 2 moles = 48 dm³).
Worked solution
At rtp, 1 mole of any gas occupies 24 dm³. If there are 2 moles, the volume is 2 × 24 = 48 dm³. Therefore, twice the number of moles gives twice the volume.