(1)向1L1mol/L的NaOH溶液中加入下列物质:①浓H2SO4;②稀硝酸;③稀醋酸,恰好完全反应的热效应为△H1、△H2、△H3,则三者由小到大顺序为______. (2)由盖斯定律结合下述反应方程式,回答问题: ①NH3(g)+HCl(g)═NH4Cl(s)△H=-176kJ/mol ②NH3(g)+H2O(l)═NH3?H2O(aq)△H=-35.1kJ/mol ③HCl(g)+H2O(l)═HCl(aq)△H=-72.3kJ/mol ④NH3?H2O(aq)+HCl(aq)═NH4Cl(aq)△H=-52.3kJ/mol 则NH4Cl(s)+2H2O(l)═NH4Cl(aq)其△H等于______ kJ/mol. (3)根据下列热化学方程式分析,写出C(s)燃烧热的热化学方程式______. C(s)+H2O(l)═CO(g)+H2(g)△H1=+175.3kJ?mol-1 2CO(g)+O2(g)═2CO2(g)△H2=-566.0kJ?mol-1 2H2(g)+O2(g)═2H2O(l)△H3=-571.6kJ?mol-1. |