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Practice question

MCQ

Question

For the process 2NO₂(g) → N₂O₄(g) , Δ H = -57.20 kJ/mol at 298 K, what is Δ U ? ( R = 8.314 J/mol·K )

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Explanation

For Δ ng = 1 - 2 = -1 , RT = 8.314 × 298 × 10⁻³ = 2.4776 kJ . Using Δ H = Δ U + Δ ng RT , Δ U = -57.20 - (-1 × 2.4776) = -57.20 + 2.4776 = -54.72 kJ/mol .

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