Practice question
Question
A mixture of 12 g C and 40 g O₂ is ignited to form CO₂ and CO. If 22 g of CO₂ is produced, what is the mass of CO formed? (Atomic masses: C = 12, O = 16)
Explanation
Moles: C = 1 mol, O₂ = 1.25 mol. Moles of CO₂ = 22/44 = 0.5 mol; C used = 0.5 mol. Remaining C = 0.5 mol forms 0.5 mol CO; mass = 0.5 × 28 = 14 g.
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