12. 已知CH
4(g)+H
2O(g)=CO(g)+3H
2(g)
△H= +206kJ / mol
CH
4(g)+CO
2(g)=2CO(g)+2H
2(g)
△H= +247kJ / mol
C—H键的键能约为413 kJ / mol, O—H键的键能约为463 kJ / mol,H—H键的键能约为436 kJ / mol,则CO
2中C=O键的键能约为
A.797.5 kJ / mol | B.900.5 kJ / mol |
C.962.5 kJ / mol | D.1595 kJ / mol |