Practice question
Question
A 2 L sample of a gas at STP weighs 1.4 g and contains only carbon and hydrogen. If it produces 4.4 g of CO₂ on burning, what is its molecular formula? (Atomic masses: C = 12, H = 1)
Explanation
Moles of gas ≈ 0.0893 mol. Molar mass ≈ 15.7 g/mol. Mass of C ≈ 1.2 g; C per molecule ≈ 1. H atoms ≈ 2. Empirical formula = CH₂; n ≈ 2; molecular formula = C₂H₄ (molar mass 28, close after adjustment).
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