28. 合成硝酸的一個重要步驟是氨氣轉化為一氧化氮。△H°f [NH3(g)] = -45.9 kJ/mol，△H°f [NO(g)] =90.3 kJ/mol，△H°f [H2O(g)] = -241.8 kJ/mol
4NH3(g) + 5O2(g)→ 4NO(g) + 6H2O(g)
計算此反應的△H°rxn。(A) -906.0 kJ (B) -197.4 KJ (C) -105.6 KJ (D) 197.4 KJ