The value of ΔG° at 25 °C for the following reaction: C₂H₄ (g) + H₂ (g) → C₂H₆ (g)
Is ________ kJ/mol.At 298 K,ΔH° for this reaction is -137.5 kJ/mol,and ΔS° is +120.5 J/K.

Question

The value of ΔG° at 25 °C for the following reaction: C₂H₄ (g)+ H₂ (g)→ C₂H₆ (g) Is ________ kJ/mol.At 298 K,ΔH° for this reaction is -137.5 kJ/mol,and ΔS° is +120.5 J/K.

Quizplus · Accepted Answer

The correct answer is B because ΔG° = ΔH° - TΔS°. At 298 K, ΔG° = -137.5 kJ/mol - (298 K)(+120.5 J/K) = -173.4 kJ/mol.

The Value of ΔG° at 25 °C for the Following