Question: 6. Lil is found to have the same structure as NaCl. Given this information, estimate the lattice energy for Lil using the Born-Mayer equation with

6. Lil is found to have the same structure as NaCl.

6. Lil is found to have the same structure as NaCl. Given this information, estimate the lattice energy for Lil using the Born-Mayer equation with p = 34.5 pm. Radius ratio rules suggest that the observed Lil structure is anomalous; explain why. The ionic radius for Lit (CN = 6 for the NaCl structure) = 76 pm and the ionic radius for I (CN = 6 for the NaCl structure) = 206 pm. Madelung constant M = 1.748 for the rock salt structure and M = 1.638 for the zinc blend structure. The physical constants are Na = 6.023 * 1023, e = 1.602x10-19, 4 1.113x10-10.(be sure that lattice energy is positive) (20 pts) = = 9 =

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