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)  △Ha 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

答案

D

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