10. Below is a proposed synthesis of compound X. Which step would not work.

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