Calculate ΔH for Reaction Using Standard Enthalpies

Practice question

Question

Calculate Δ H for C(s) + 2H₂O(g) → CO₂(g) + 2H₂(g) using: Δ Hf° (H₂O,g) = -241.8 kJ/mol, Δ Hf° (CO₂,g) = -393.5 kJ/mol.

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-90.1 kJ/mol 483.6 kJ/mol 90.1 kJ/mol Correct -393.5 kJ/mol

Δ H = [Δ Hf° (CO₂) + 2 × Δ Hf° (H₂)] - [Δ Hf° (C) + 2 × Δ Hf° (H₂O)] = [-393.5 + 0] - [0 + 2(-241.8)] = -393.5 + 483.6 = 90.1 kJ/mol.

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