Practice question
Question
For the reaction H₂(g) + (1/2)O₂(g) → H₂O(l) , Δ H = -286.00 kJ/mol . If Δ ng = -1.5 , what is Δ U at 298 K? ( R = 8.314 J/mol·K )
Explanation
For Δ ng = -1.5 , RT = 8.314 × 298 × 10⁻³ = 2.4776 kJ . Using Δ H = Δ U + Δ ng RT , Δ U = -286.00 - (-1.5 × 2.4776) = -286.00 + 3.7164 = -282.28 kJ/mol .
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