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P.-P.键的键能大于P.-Cl键的键能 可求Cl2(g)+ PCl3(g)==4PCl5(s)的反应热△H. Cl-Cl键的键能为(b-a+5.6c)/4 kJmol-1 P.-P.键的键能为(5a-3b+12c)/8 kJmol-1
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431 KJ/mol 946 KJ/mol 649 KJ/mol 869 KJ/mol
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