Use the Born–Haber cycle to calculate the enthalpy of formation of KBr, which crystallizes in the NaCl lattice. Use these data in the calculation: ΔHvap(Br2) = 29.8 kJ/mol; Br2 bond energy = 190.2 kJ/mol; and ΔHsub(K) = 79 kJ/mol.
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