题目内容
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( )
A．①② B．①③
C．①②③ D．全部
B
【解析】
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)===1/2N2(g)＋3/2H2(g) ΔH＝＋46.2 kJ/mol
④2NH3(g)===N2(g)＋3H2(g) ΔH＝－92.4 kJ/mol
A．①③ B．②④ C．②③ D．①④
③NH3(g)===N2(g)＋H2(g) ΔH＝＋46.2 kJ/mol
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/mol②N2(g)＋3H2(g)===2NH3(g) ΔH＝－46.2 kJ/mol③NH3(g)===1/2N2(g)＋3/2H2(g) ΔH＝＋46.2 kJ/mol④2NH3(g)===N2(g)＋3H2(g) ΔH＝－92.4 kJ/mol
