17. What is the enthalpy of formation of MgO, which crystallizes in the NaCl lattice (use the Born-Haber cycle to calculate). Use these data in the calculation: O₂ bond energy = 494 kJ/mol; ΔHsub(Mg) = 37 kJ/mol. Second ionization energy of Mg = 1451 kJ/mol; second electron affinity of O = -744 kJ/mol.
(A) 2352 kJ mol^-1
(B) -3934 kJ mol^-1
(C) -1341 kJ mol^-1
(D) 1341 kJ mol^-1

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