问题
选择题
化学反应N2＋3H2===2NH3的能量变化如下图所示，该反应的热化学方程式是
A．N2(g)＋3H2(g)===2NH3(l) ΔH＝2(a－b－c)kJ/mol
B．N2(g)＋3H2(g)===2NH3(g) ΔH＝2(b－a)kJ/mol
C．1/2N2(g)＋3/2H2(g)===NH3(l) ΔH＝(b＋c－a)kJ/mol
D．1/2N2(g)＋3/2H2(g)===NH3(g) ΔH＝(a＋b)kJ/mol
答案
答案：A