6884. Enthalpy of formation of NH₃ is – 46 kJ/kg mole. The enthalpy change for the gaseous reaction, 2NH₃ → N₂ + 3H₂, is equal to __________ kJ/kg. mole. September 7, 2025 by Admin 46 92 -23 -92 ✅ The correct answer is option B.