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Practice question

MCQ

Question

Calculate Δ H for C₃H₈(g) + 5O₂(g) → 3CO₂(g) + 4H₂O(l) using: Δ Hf° (C₃H₈,g) = -103.8 kJ/mol, Δ Hf° (CO₂,g) = -393.5 kJ/mol, Δ Hf° (H₂O,l) = -285.8 kJ/mol.

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Explanation

Δ H = [3(-393.5) + 4(-285.8)] - [-103.8 + 5(0)] = -1180.5 - 1143.2 + 103.8 = -2219.9 kJ/mol.

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