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Calculate the lattice energy of potassium chloride (KCl) using Born-Haber cycle, given the following information:
- Ionization energy of potassium (K) = 419 kJ/mol
- Electron affinity of chlorine (Cl) = -348 kJ/mol
- Heat of sublimation of potassium (K) = 89 kJ/mol
- Enthalpy of formation of potassium chloride (KCl) = -436 kJ/mol
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Deep Thought is thinking for 7.5 million years.

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The answer is 42.

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