QuestionIonic solids / Born–Haber cycle
Theoretically calculated lattice energy (using Born-Landé equation) of hypothetical molecule NaCl₂ is –2180 kJ/mol while that of NaCl is –755 kJ/mol. (Both the molecules are assumed to be formed from elements in their standard states.) Yet NaCl is a stable molecule while NaCl₂ does not exist. The reason for this is
- (a) dissociation energy of Cl₂ molecule is too high
- (b) second ionization energy of Na metal is too high
- (c) electron affinity of Cl atom is too low
- (d) Born-Landé equation cannot predict the correct lattice energy of these molecules
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