Practice question

MCQ

Question

For the reaction H₂(g) + I₂(g) → 2HI(g), Δ H = 52.96 kJ/mol at 298 K. What is Δ U? (R = 8.314 J/mol·K)

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50.48 kJ/mol 55.44 kJ/mol 52.96 kJ/mol Correct 0 kJ/mol

Δ ng = 2 - 2 = 0, so Δ H = Δ U + Δ ng RT = Δ U. Thus, Δ U = 52.96 kJ/mol.

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