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Practice question

MCQ

Question

Using Hess’s law, calculate Δ H for C(graphite) + 2H₂(g) → CH₄(g), given: C(graphite) + O₂(g) → CO₂(g), Δ H = -393.5 kJ/mol; H₂(g) + (1/2)O₂(g) → H₂O(l), Δ H = -285.8 kJ/mol; CH₄(g) + 2O₂(g) → CO₂(g) + 2H₂O(l), Δ H = -890.3 kJ/mol.

Options

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Explanation

Reverse the third equation and add the first two: Δ H = -393.5 + (-2 × 285.8) + 890.3 = -74.8 kJ/mol.

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