290K,100Kpa时,已知;2H2O(g)=o2(g)+2H2(g)△H1Cl2(g)+H2(g)=2Hcl(g△H22Cl(g)+2H2O(g)4Cl(g)+O2(g)
接上△H3△H1与△H2和△H3之间的关系