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For a diatomic molecule AB, the electronegativity difference between A and B=0.2028 sqrt triangle where triangle=[Bond energy of AB- Geometric mean of the bond energies of A_2 and B_2]. The electonegativities of fluorine and chlorine are 4.0 and 3.0 respectively and the bond energies are of F-F : 38 kcal mol^-1 and Cl-Cl : 58 kcal mol^-1. The bond energy of Cl-F is: |
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Answer» 71 kcal/mol |
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