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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