Using the molar volume in calculations with chemical equations
2 marks · EasyCalculate the number of moles of helium gas in a 12 dm³ container at room temperature and pressure.
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0.50 mol (±0.01)
Also accept: 12/24 = 0.5; 12÷24 = 0.5
Common mistakes: 24/12; using 24000 for dm³
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Marking points
M1 · 1 mark · Chooses correct formula: moles = volume (dm³) / 24 (dm³ per mol).
A1 · 1 mark · 0.50 mol (accept 0.5). Units not required but must be correct if given.
Worked solution
Number of moles = 12 ÷ 24 = 0.50 mol