已知：C(s)＋H2O(g)＝CO(g)＋H2(g) △H＝a kJ/mol 2C(s)＋O2(g)＝2CO(g)

已知：C(s)＋H₂O(g)＝CO(g)＋H₂(g) △H＝a kJ/mol

2C(s)＋O₂(g)＝2CO(g) △H＝－220 kJ/mol

H－H、O＝O和O－H键的键能分别为436、496和462 kJ/mol，则a为（）

A．－332 B．－118 C．＋350 D．＋130

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已知：C(s)＋H2O(g)＝CO(g)＋H2(g) △H＝a kJ/mol 2C(s)＋O2(g)＝2CO(g)

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