Waec Model Questions Vol1 2021 Chemistry Question 35
Practice objective / multiple choice question 35 from the 2021 Waec Model Questions Vol1 Chemistry examination.
Standard enthalpies of formation (ΔH_f°) for the oxides of four non‑metals are: CO₂ = -393.5 kJ mol⁻¹, SO₂ = -296.8 kJ mol⁻¹, NO₂ = +33.2 kJ mol⁻¹, P₂O₅ = -1499 kJ mol⁻¹ (per mole of P₂O₅). Using these data, determine which element (C, S, N or P) forms the thermodynamically most stable oxide per mole of oxygen consumed at 298 K. Show your calculations.
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About This Question
This is Waec Model Questions Vol1 2021 Chemistry Question 35. It is one of the objective questions from the 2021 Waec Model Questions Vol1 Chemistry examination.
Difficulty level: Hard .
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