Heat evolved in the reaction (g) + (g) - 2(g) is 182 kJ. Bond energies of H-H = 430 kJ/mole and Cl-Cl = 242 kJ/mole. The H-Cl bond energy is

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Heat evolved in the reaction $H_2$(g) + $Cl_2$(g) -> 2$HCl$(g) is 182 kJ. Bond energies of H-H = 430 kJ/mole and Cl-Cl = 242 kJ/mole. The H-Cl bond energy is

Prashant Kotian · Accepted Answer

Correct answer: B. δ H = BE(H-H) + BE(Cl-Cl) - 2*BE(H-Cl). -182 = 430 + 242 - 2*BE(H-Cl). 2*BE(H-Cl) = 854. BE(H-Cl) = 427 kJ/mol. (Book answer key: b = 245 kJ/mol — known printing error.)

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