已知: ①C(s)＋H2O(g)＝CO(g)＋H2(g) ΔH＝akJ·mol－1
② C(s)＋ 1/2 O2(g) ＝CO(g) ΔH＝－110kJ·mol－1
H－H、O＝O和O－H键的键能分别为436 kJ·mol－1、496 kJ·mol－1和462kJ·mol－1,则a为
| A．－332 | B．－118 |
| C．＋350 | D．＋130 |
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