题目

 If we had set off yesterday, we _____ on the beach in Hawaii, enjoying the sunshine right now. A. are lying       B. will be lying    C. would be lying        D. would have lain 答案：C已知：P4（g）+6Cl2（g 4PCl3（g）ΔH= kJ·mol-1，P4（g）+10Cl2（g）4PCl5（g） ΔH=b kJ·mol-1，P4具有正四面体结构，PCl5中P－C1键的键能为c kJ·mol-1，PCl3中P－C1键的键能为1.2c kJ·mol-1。下列叙述正确的是A．P－P键的键能大于P－C1键的键能B．可求Cl2（g）+PCl3（g）PCl5（s）的反应热ΔHC．C1－C1键的键能为（b－+5.6c）/4kJ·mol－1D．P－P键的键能为（5－3b+12c）/8kJ·mol－1