题干
当1 g氨气完全分解为氮气、氢气时，吸收2.72 kJ的热量，则下列热化学方程式正确的是( )
①N2(g)＋3H2(g)===2NH3(g) ΔH＝－92.4 kJ/mol
②N2(g)＋3H2(g)===2NH3(g) ΔH＝－46.2 kJ/mol
③NH3(g)===N2(g)＋H2(g) ΔH＝＋46.2 kJ/mol
④2NH3(g)===N2(g)＋3H2(g) ΔH＝－92.4 kJ/mol
①N2(g)＋3H2(g)===2NH3(g) ΔH＝－92.4 kJ/mol
②N2(g)＋3H2(g)===2NH3(g) ΔH＝－46.2 kJ/mol
③NH3(g)===N2(g)＋H2(g) ΔH＝＋46.2 kJ/mol
④2NH3(g)===N2(g)＋3H2(g) ΔH＝－92.4 kJ/mol
A：①②
B：①③
C：①②③
D：全部
答案(点此获取答案解析）
B
