H12HClgCl的精选

问题详情：在298K、100kPa时，已知：2H2O(g)===O2(g)＋2H2(g)ΔH12HCl(g)===Cl2(g)＋H2(g)ΔH22Cl2(g)＋2H2O(g)===4HCl(g)＋O2(g)ΔH3则ΔH3与ΔH1和ΔH2间的关系正确的是()A．ΔH3＝ΔH1＋2ΔH2   B．ΔH3＝ΔH1＋ΔH2 C．ΔH3＝ΔH1－ΔH2  D...