Lattice Energy : Part I and II

Lattice Energy, ∆H^Θl_at.

∆H^Θ_lat. is the energy released when 1 mol of an ionic compound in the solid state is formed from its gaseous ions under standard conditions.

Na+(g) + Cl-(g) → NaCl(s) ∆H^Θ_lat.= -788 kJ mol^-1.

Magnitude of lattice energy is proportional to the charge on the ion and is inversely proportional to the interionic distance (r+ + r-) .