The value of Δ_fG° at 141.0 °C for the formation of phosphorus trichloride from its constituent elements, P₂(g) + 3Cl₂(g) → 2PCl₃(g)
Is __________ kJ mol^-1. At 25.0 °C for this reaction, Δ_fH° is -720.5 kJ mol^-1 and Δ_fS° is -263.7 J K^-1 mol^-1.

Question

Quizplus · Accepted Answer

Δ_fG° = Δ_fH° - TΔ_fS°= -720.5 kJ mol^-1 - (141.0 + 273.15) K × (-263.7 J K^-1 mol^-1) × (1 kJ/1000 J)= -720.5 kJ mol^-1 + 109.5 kJ mol^-1= -611.0 kJ mol^-1

The Value of ΔfG° at 141

The Value of Δ_fG° at 141