②CO(g)+1/2O2(g) =CO2(g) ΔH=-283 kJ·mol-1
③C(s)+1/2O2(g)=CO(g) ΔH=-110kJ·mol-1
则反应Fe2O3(s)+3C(s)+ 3/2O2(g) =2Fe(s)+3CO2(g)的焓变是( )
①N2(g)+2O2(g)=N2O4(g)ΔH=+8.7 kJ·mol-1
②N2H4(g)+O2(g)=N2(g)+2H2O(g)ΔH=-534.0 kJ·mol-1
下列表示肼跟N2O4反应的热化学方程式正确的是( )
H2S(g)+ 32 O2(g)═SO2(g)+H2O(g)△H1
2H2S(g)+SO2(g)═ 32 S2(g)+2H2O(g)△H2
H2S(g)+ 12 O2(g)═S(g)+H2O(g)△H3
2S(g)═S2(g)△H4
则△H4的正确表达式为( )
H2O(g)=H2(g)+ 12 O2(g) ΔH=+241.8 kJ/mol
H2(g)+ 12 O2(g)=H2O(l) ΔH=-285.8 kJ/mol,当1 g液态水变为水蒸气时,其热量变化是( )