GKFix MCQ Question

What is the standard reaction enthalpy for ½N₂(g) + ³⁄₂H₂(g) → NH₃(g) if ∆rH⁰ = –91.8 kJ for 2NH₃ formation?

• A. –91.8 kJ mol⁻¹
• B. +45.9 kJ mol⁻¹
• C. –45.9 kJ mol⁻¹
• D. +91.8 kJ mol⁻¹