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1. Compare lattice energies of LiI and PbI2 and calculate the formation enthalpy in each case by constructing a Born-Haber cycle. Which one is more ionic? Comment.

2. Use Kapustinski's equation for lattice energies and an appropriate Born Haber cycle to compare the energies of formation of PbO and PbO2 (IPPb (kJ/mol): 715.5 (1), 1,450.4 (2), 3,081.5 (3), 4,083 (4))

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