Using crystal radii from Appendix B-1 , calculate the lattice energy for PbS, which crystallizes in the NaCl structure. Compare the results with the Born–Haber cycle values obtained using the ionization energies and the following data for enthalpies of formation. Remember that enthalpies of formation are calculated beginning with the elements in their standard states. Use these data: ΔHf: S2-(g), 535 kJ/mol; Pb(g), 196 kJ/mol; PbS, –98 kJ/mol. The second ionization energy of Pb = 15.03 eV.
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