GKFix MCQ Question

What is the ∆rH⁰ for the reaction: ½N₂ + ³⁄₂H₂ → NH₃, if 2NH₃ formation is –91.8 kJ?

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