The heat of formation of crystalline sodium chloride is -410 kJ mol-1. The heat of sublimation of sodium metal is 180.8 kJmol-1. The heat of dissociation of chlorine gas into atoms is 242.7 kJ mol-1. The ionisation energy of Na and electron affinity of Cl are 493.7kJ and -368.2 kJ respectively. Calculate the lattice energy of NaCl.
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Answer:
-765.65 KJ/mol is the right answer.
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Answer: -765.75KJ
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