GKFix MCQ Question

What is the correct expression for the standard enthalpy change of the reaction: N₂(g) + 3H₂(g) → 2NH₃(g)?

• A. [Hm(NH₃, g)] – [Hm(N₂, g) + Hm(H₂, g)]
• B. [2Hm(NH₃, g)] – [Hm(N₂, g) + 3Hm(H₂, g)]
• C. [3Hm(NH₃, g)] – [2Hm(N₂, g) + Hm(H₂, g)]
• D. [Hm(N₂, g) + 3Hm(H₂, g)] – [2Hm(NH₃, g)]