# How would we prepare metallic sodium and gaseous chlorine from sodium chloride?

In the Born Haber cycle, the energetics of the formation of ionic salts are exhaustively measured and estimated. Formation of salt is thermodynamically downhill. In principle, $N {a}^{+}$ could be reduced down to sodium metal; it would take a lot of energy and bother. $C {l}^{-}$ anion could be oxidized up to $C {l}_{2} \left(g\right)$ rather more easily.