已知:C(s)+H2O(g)=CO(g)+H2(g) ΔH=+130kJ·mol-1
2C(s)+O2(g)=2CO(g) ΔH=-220kJ·mol-1。其中H-H和O-H键的键能分别为436 kJ·mol-1和462kJ·mol-1,则O=O键的键能为
A.496 kJ·mol-1 | B.248 kJ·mol-1 |
C.428 kJ·mol-1 | D.284 kJ·mol-1 |
已知:C(s)+H2O(g)=CO(g)+H2(g) ΔH=+130kJ·mol-1
2C(s)+O2(g)=2CO(g) ΔH=-220kJ·mol-1。其中H-H和O-H键的键能分别为436 kJ·mol-1和462kJ·mol-1,则O=O键的键能为
A.496 kJ·mol-1 | B.248 kJ·mol-1 |
C.428 kJ·mol-1 | D.284 kJ·mol-1 |