(1)已知下列各反应的焓变
①Ca(s)+C(s,石墨)+
②Ca(s)+1/2O2(g)=CaO(s)△H2=-635.1kJ/mol
③C(s,石墨)+O2(g)=CO2(g)△H3=-393.5kJ/mol
试求:④CaCO3(s)=CaO(s)+CO2(g)△H=______.
(2)已知下列各反应的焓变
①CO(g)+
②H2(g)+
③C2H5OH(l)+3O2(g)=2CO2(g)+3H2O(l)△H3=-1370kJ/mol
试求:④2CO(g)+4H2(g)=H2O(l)+C2H5OH(l)△H=______.