摘要:15.已知反应:+ O2(g)== CO2(g) △H = -393.5kJ/mol + O2(g)== 2CO2(g) △H = -566.0kJ/mol 则反应:C(s)+ O2的△H 是B A.-221 kJ/mol B.-110.5 kJ/mol C.+110.5 kJ/mol D.+221 kJ/mol 化学键 Si-O O=O Si-Si 键能/kJ·mol-1 X 498.8 176

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