Practice question
Question
For an exothermic reaction with Δ H = -100.00 kJ/mol and Δ ng = -1 at 298 K, what is Δ U ? ( R = 8.314 J/mol·K )
Explanation
For Δ ng = -1 , RT = 8.314 × 298 × 10⁻³ = 2.4776 kJ . Using Δ H = Δ U + Δ ng RT , Δ U = -100.00 - (-1 × 2.4776) = -100.00 + 2.4776 = -97.52 kJ/mol .
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