Practice question
Question
For the reaction 2A(g) + B(g) → 2D(g) , Δ U = -10.5 kJ , Δ S = -44.1 J/K at 298 K. What is Δ G ?
Explanation
Calculate Δ H = Δ U + Δ ng RT , where Δ ng = 2 - 3 = -1 , RT = 8.314 × 298 × 10⁻³ = 2.4776 kJ . Thus, Δ H = -10.5 - 2.4776 = -12.9776 kJ . Then, Δ G = Δ H - TΔ S = -12.9776 - 298 × (-0.0441) = -12.9776 + 13.1418 = 0.15 kJ .
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