Hydrogen reacts with nitrogen to form ammonia (NH₃) according to the reaction The value of $\Delta$H $\circ$ is -92.38 kJ/mol, and that of $\Delta$S $\circ$ is -198.2 J/(mol . K). Determine $\Delta$G $\circ$ at 25 $\circ$ C.

Question

Quizplus · Accepted Answer

The Gibbs free energy change for a reaction can be calculated using the equation: ΔG° = ΔH° - TΔS°, where ΔH° is the enthalpy change, ΔS° is the entropy change, and T is the temperature in Kelvin. Given that ΔH° = -92.38 kJ/mol and ΔS° = -198.2 J/(mol K) = -0.1982 kJ/(mol K), we can calculate ΔG° at 25°C (298 K):
ΔG° = -92.38 kJ/mol - 298 K x (-0.1982 kJ/(mol K)) = -92.38 kJ/mol + 59.1536 kJ/mol = -33.2264 kJ/mol
Therefore, the best choice is C: (F1F1F1S1F1F1F1033.32 kJ/mol).

Hydrogen Reacts with Nitrogen to Form Ammonia (NH3) According to the Reaction

Hydrogen Reacts with Nitrogen to Form Ammonia (NH₃) According to the Reaction