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Q.
Consider the Born-Haber cycle,
Identify I, II, III in the above Born-Haber cycle.
Thermodynamics
Solution:
(a) In the given Born-Haber cycle, I, II and III represents respectively as follows :
I. Electron gain enthalpy as one mole of anion being formed from gaseous atoms in its ground state;
i.e. $Cl (g)+e^{-} \longrightarrow Cl ^{-}(g)$
II. Enthalpy of sublimation as one mole of vapour formed from the solid,
i.e. $Na (s) \longrightarrow Na (g)$
III. Ionisation enthalpy as one mole of an electrolyte completely dissociates into ions,
i.e. $Na (g) \longrightarrow Na ^{+}(g)+e^{-}$
