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Practice question

MCQ

Question

Calculate Δ H for C(s) + (1/2)O₂(g) → CO(g) given: C(s) + O₂(g) → CO₂(g), Δ H = -393.5 kJ/mol; CO(g) + (1/2)O₂(g) → CO₂(g), Δ H = -283 kJ/mol.

Options

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Explanation

Using Hess’s law: Δ H = -393.5 - (-283) = -393.5 + 283 = -110.5 kJ/mol.

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