GKFix MCQ Question

What is the standard enthalpy change of formation (ΔfH°) for ammonia (NH3)?

• A. -46.1 kJ mol⁻¹
• B. +46.1 kJ mol⁻¹
• C. -92.2 kJ mol⁻¹
• D. +92.2 kJ mol⁻¹