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Q.
Born-Haber cycle is used to determine :
AFMCAFMC 2002
Solution:
Born Haber cycle is used to determine lattice energy $(LE)$ of ionic crystals to other thermodynamics data [i.e., ionisation energy $(IE)$, electron affinity $(EA)$ dissociation energy $(D)$ etc.)
e.g., let us consider formation of $NaCl$
$Na (s)+$ sublimation energy $(S) \longrightarrow Na (g)$
$\frac{1}{2} Cl _{2}(g)+\frac{D}{2} \longrightarrow Cl (g)$
$Na (g)+ IE \longrightarrow Na ^{+}(g)+e^{-}$
$Cl (g)+e^{-} \longrightarrow Cl ^{-}(g)+ EA$
$Na ^{+}(g)+ Cl ^{-}(g) \longrightarrow NaCl + LE$
$\Delta H_{f}=S+\frac{1}{2} D+ IE + EA + LE$