Use the born-haber cycle to calculate the lattice energy of kcl. (δhsub for potassium is 89.0 kj/mol, ie1 for potassium is 419 kj/mol, ea1 for chlorine is - 349 kj/mol, the bond energy of cl2 is 243 kj/mol, δh∘f for kcl is - 436.5 kj/mol.)
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