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The lattice energy of KF is 794 kJ/mol, and the interionic distance is 269 pm. The Na-F distance in NaF, which has

the same structure as KF, is 231 pm. Which of the following values is the closest approximation of the lattice energy of NaF: 682 kJ/mol, 794 kJ/mol, 924 kJ/mol, 1588 kJ/mol, or 3175 kJ/mol?

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