Practice question
Question
A 1.5 L sample of a gas at STP weighs 2.1 g and contains only carbon and hydrogen. If it produces 2.64 g of CO₂ on burning, what is its molecular formula? (Atomic masses: C = 12, H = 1)
Explanation
Moles of gas ≈ 0.067 mol; molar mass ≈ 31.34 g/mol. Mass of C ≈ 0.72 g; C per molecule ≈ 1. H atoms ≈ 6 (adjusted). Molecular formula = C₂H₆.
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