反应I
反应Ⅱ
下列说法正确的是( )
① 2O2(g)+N2(g)=N2O4(l) ΔH1
② N2(g)+2H2(g)=N2H4(l) ΔH2
③ O2(g)+2H2(g)=2H2O(g) ΔH3
④ 2 N2H4(l)+N2O4(l)=3N2(g)+4H2O(g) ΔH4=﹣1048.9 kJ·mol-1
①CO2(g)+2H2O(l) === CH3OH(g)+ O2(g) ΔH1=+764.5 kJ·mol-1
②CO(g)+ O2(g)===CO2(g) ΔH2=-283.0 kJ·mol-1
③H2(g)+ O2(g)===H2O(l) ΔH3=-285.8 kJ·mol-1
下列有关说法正确的是( )
①太阳光催化分解水制氢:2H2O(l)═2H2(g)+O2(g)△H1=571.6kJ•mol﹣1
②焦炭与水反应制氢:C(s)+H2O(g)═CO(g)+H2(g)△H2=131.3kJ•mol﹣1
③甲烷与水反应制氢:CH4(g)+H2O(g)═CO(g)+3H2(g)△H3=206.1kJ•mol﹣1 .
C(s)+H2O(g)═CO(g)+H2(g)△H=bkJ•mol﹣1
H﹣H,O﹣H和O=O键的键能分别为436、462和495kJ•mol﹣1 , 则b为( )
SiCl4(g)+2Zn(l)⇌Si(s)+2ZnCl2(g)△H1
SiCl4(g)+2Zn(g)⇌Si(s)+2ZnCl2(g)△H2 .
主反应:(g,甲基环氧乙烷)
副反应:(g,丙醛) (a、b都大于0)
请回答下列问题:
I.CO(g)+2H2(g)⇌CH3OH(g) ΔH1=-90.7kJ·mol-l
II.2CH3OH(g)⇌CH3OCH3(g)+H2O(g) ΔH2=-24.5kJ·mol-1
回答下列问题:
I.CO2(g)+H2(g)CO(g)+H2O(g) △H1=+41kJ·mol-1
II.CO2(g)+4H2(g)CH4(g)+2H2O(g) △H2
III.CO2(g)+CH4(g)2CO(g)+2H2(g) △H3=+247kJ·mol-1
反应1:
反应2:
I.CO2(g)+3H2(g)⇌CH3OH(g)+H2O(g) ΔH1
II.CO2(g)+H2(g)⇌CO(g)+H2O(g) ΔH2=+41.5kJ·mol-1
I.CO(g)+3H2(g)CH4(g)+H2O(g) △H=-206.2kJ·mol-1
II.CO2(g)+4H2(g)CH4(g)+2H2O(g) △H=a kJ·mol-1
反应I:CH4(g)+H2O(g)CO(g)+3H2(g) ΔH1=+206kJ·mol-1
反应II:CH4(g)+2H2O(g)CO2(g)+4H2(g) ΔH2
反应III:CO(g)+H2O(g)CO2(g)+H2(g) ΔH3=-165 kJ·mol-1
反应i C2H6(g) C2H4(g)+ H2(g) ∆H1=+ 137kJ·mol-1
反应ii CO2(g)+H2(g) CO(g)+ H2O(g) ∆H2