Practice question
Question
A 1 L sample of a gas at STP weighs 1.25 g and contains only carbon and hydrogen. If it produces 2.2 g of CO₂ on burning, what is its molecular formula? (Atomic masses: C = 12, H = 1)
Explanation
Moles of gas ≈ 0.0446 mol; molar mass ≈ 28 g/mol. Mass of C ≈ 0.6 g; C per molecule ≈ 1. H atoms ≈ 4 (adjusted). Molecular formula = C₂H₄.
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