Waec Model Questions Vol1 2024 Chemistry Question 9
Practice objective / multiple choice question 9 from the 2024 Waec Model Questions Vol1 Chemistry examination.
The standard enthalpies of formation are: ΔH_f°(C₈H₁₈) = -250 kJ·mol⁻¹, ΔH_f°(CO₂) = -393.5 kJ·mol⁻¹, ΔH_f°(H₂O, l) = -285.8 kJ·mol⁻¹. Using Hess's law, calculate the heat released when 2.5 mol of octane (C₈H₁₈) combust completely in excess O₂. Express your answer in kilojoules, to three significant figures, and include the sign.
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This is Waec Model Questions Vol1 2024 Chemistry Question 9. It is one of the objective questions from the 2024 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Medium .
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