H1H2g的精选

问题详情：(2017·全国卷Ⅲ)已知：As(s)＋H2(g)＋2O2(g)===H3AsO4(s)ΔH1H2(g)＋O2(g)===H2O(l)ΔH22As(s)＋O2(g)===As2O5(s)ΔH3则反应As2O5(s)＋3H2O(l)===2H3AsO4(s)的ΔH＝________。【回答】解析：由盖斯定律可知①×2－②×3－③可得...