Bond energies of H - H and CI - CI are 430kJmol−1 and 242kJmol−1 respectively. ΔHf for HCl is 91kJmol−1 . What will be the bond energy of H - Cl bond (per mole value)?
A
672 kJ
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B
182 kJ
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C
245 kJ
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D
88 kJ
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Solution
The correct option is C 245 kJ 12H2+12Cl2→HCl ΔHf(HCl)=91kJmol−1, H - H = 430 kJ mol−1, Cl - Cl = 242 kJ mol−1 91=12×430+12×242−B.E.(H−Cl) B.E. (H-Cl) = 245 kJ