Calculating the volume of a certain number of moles

3 marks · Normal

Calculate the volume, in cm³, of 0.45 mol of helium gas at rtp. Show your working.

Work this out on paper, then compare with the answer and worked solution below. With a free account you can submit written answers for marking.

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10,800 cm³ (±2)

Must show: Working shown, Correct formula used, Correct units in final answer

Also accept: Volume = 0.45 x 24000 = 10800 cm³

Common mistakes: Using wrong molar volume (e.g. 22.4 dm³ or 22400 cm³); Giving answer in dm³ rather than cm³

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Marking points

M1 · 1 mark · Writes or uses the correct formula: volume (cm³) = moles × 24000

M2 · 1 mark · Inserts numbers correctly (0.45 × 24000)

A1 · 1 mark · Calculates 10,800 cm³

Worked solution

Molar volume at rtp = 24,000 cm³ per mole.