The value of Δ_fG° at 100.0 °C for the formation of calcium chloride from its constituent elements, Ca(s) + Cl₂(g) → CaCl₂(s)
Is __________ kJ mol^-1. At 25.0 °C for this reaction, Δ_fH° is -795.8 kJ mol^-1l, Δ_fG° is -748.1 kJ mol^-1, and Δ_fS° is -159.8 J K^-1 mol^-1.

Question

Quizplus · Accepted Answer

To find ΔfG° at 100.0 °C, use the equation ΔfG° = ΔfH° - TΔfS°. Convert 100.0 °C to Kelvin (373.15 K) and ΔfS° to kJ (by dividing by 1000). ΔfG° = -795.8 kJ/mol - (373.15 K)(-0.1598 kJ/K/mol) = -736.2 kJ/mol.

The Value of ΔfG° at 100

The Value of Δ_fG° at 100