试题 试卷
题型:单选题 题类:常考题 难易度:普通
有关反应热的计算a
Fe(s)+ O2(g)═FeO(s)△H=﹣272kJ•mol﹣1
2Al(s)+ O2(g)═Al2O3(s)△H=﹣1675kJ•mol﹣1
则2Al(s)+3FeO(s)═Al2O3(s)+3Fe(s)的△H是( )
①Fe2O3(s)+3CO(g)═2Fe(s)+3CO2(g)△H1=﹣26.7kJ•mol﹣1
②3Fe2O3(s)+CO(g)═2Fe3O4(s)+CO2(g)△H2=﹣50.75kJ•mol﹣1
③Fe3O4(s)+CO(g)═3FeO(s)+CO2(g)△H3=﹣36.5kJ•mol﹣1
则反应FeO(s)+CO(g)═Fe(s)+CO2(g)的焓变为( )
①H2(g)+ O2(g)=H2O(g)△H=﹣242kJ/mol;
②2H2(g)+O2(g)=2H2O(l)△H=﹣572kJ/mol;
③C(s)+ O2(g)=CO(g)△H=﹣110.5kJ/moL;
④C(s)+O2(g)=CO2(g)△H=﹣393.5kJ/moL;
⑤CO2(g)+2H2O(g)=CH4(g)+2O2(g)△H=+802kJ/moL
化学键
O=O
C﹣C
H﹣H
O﹣O
C﹣O
O﹣H
C﹣H
键能kJ/mol
497
348
436
142
351
463
414
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