Practice question
Question
Calculate Δ H for C(s) + 2S(s) → CS₂(l) given: CS₂(l) + 3O₂(g) → CO₂(g) + 2SO₂(g), Δ H = -1076.8 kJ/mol; C(s) + O₂(g) → CO₂(g), Δ H = -393.5 kJ/mol; S(s) + O₂(g) → SO₂(g), Δ H = -296.8 kJ/mol.
Explanation
Reverse first: Δ H = 1076.8 kJ. Second: Δ H = -393.5 kJ. Third (×2): Δ H = -593.6 kJ. Add: 1076.8 - 393.5 - 593.6 = 89.7 kJ/mol.
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