GKFix MCQ Question

N₂(g) + 3H₂(g) → 2NH₃(g); ΔrH⁰ = –92.4 kJ mol⁻¹. What is the standard enthalpy of formation of NH₃ gas?

• A. -92.4 kJ mol⁻¹
• B. -46.2 kJ mol⁻¹
• C. -23.1 kJ mol⁻¹
• D. -184.8 kJ mol⁻¹