Using the molar volume in calculations with chemical equations

3 marks · Normal

Calculate the number of moles in 360 cm³ of nitrogen gas at room temperature and pressure. Give your answer to two decimal places. (Molar volume = 24,000 cm³ at rtp)

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0.02 mol (±0.001)

Also accept: 0.015 mol

Common mistakes: Using wrong units (e.g., using 24 instead of 24000); Not converting cm³ to dm³

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Marking points

M1 · 1 mark · Uses correct formula: moles = volume / molar volume

M2 · 1 mark · Uses correct units for molar volume (24,000 cm³)

A1 · 1 mark · Correct calculation: 360/24,000 = 0.015 mol (accept to 2 or 3 sig. fig.) (follow-through)

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