试题 试卷
题型:综合题 题类:常考题 难易度:普通
2H2(g)+O2(g)═2H2O(l)△H=﹣571.6kJ•mol﹣1
C3H8(g)+5O2(g)═3CO2(g)+4H2O(l)△H=﹣2 220kJ•mol﹣1
根据上面两个热化学方程式,试回答下列问题:
①CO(g)+ O2(g)═CO2(g)△H1=﹣a kJ/mol
②H2(g)+ O2(g)═H2O(l)△H2=﹣b kJ/mol
③C2H5OH(l)+3O2(g)═2CO2(g)+3H2O(l)△H3=﹣c kJ/mol
①C2H2(g)+ O2(g)═2CO2(g)+H2O(l)△H1=﹣1301.0kJ•mol﹣1
②C(s)+O2(g)═CO2(g)△H2=﹣393.5kJ•mol﹣1
③H2(g)+ O2(g)═H2O(1)△H3=﹣285.8kJ•mol﹣1
则反应④2C(s)+H2(g)═C2H2(g)的△H为( )
C(s)+O2(g)=CO2(g) △H1=-393.5 kJ·mol-1①
H2(g)+ O2(g)=H2O(g) △H2=-242.0kJ·mol-1②
CO(g)+ O2(g)=CO2(g) △H3=-283.0kJ·mol-1③
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