Gce Model Questions Vol1 2025 Chemistry Question 9
Practice objective / multiple choice question 9 from the 2025 Gce Model Questions Vol1 Chemistry examination.
A sample of an unknown alkane CₙH₂ₙ₊₂ is combusted completely in excess O₂, producing 88.0 g of CO₂ and 54.1 g of H₂O. Determine the molecular formula of the alkane and calculate its standard enthalpy of combustion per mole, given ΔH_f°(CO₂) = -393.5 kJ mol⁻¹, ΔH_f°(H₂O, l) = -285.8 kJ mol⁻¹ and ΔH_f°(alkane) ≈ -(n·20) kJ mol⁻¹.
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This is Gce Model Questions Vol1 2025 Chemistry Question 9. It is one of the objective questions from the 2025 Gce Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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