Practice question
Question
For C₂H₄(g) + 3O₂(g) → 2CO₂(g) + 2H₂O(l), Δ H = -1411 kJ/mol at 298 K, what is Δ U? (R = 8.314 J/mol·K)
Explanation
Δ ng = 2 - 3 = -1, RT = 2.48 kJ, Δ H = Δ U + Δ ng RT, Δ U = -1411 - (-1 × 2.48) = -1411 + 2.48 = -1408.52 kJ/mol.
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