3. 估計 Na(s) +1/2Cl₂(g) → NaCl(s) 之 ΔH°f
NaCl 之格子能(Lattice energy):-786 kJ/mol
Na 之游離能(Ionization energy):495 kJ/mol
Cl 之電親和力(Electron affinity):-349 kJ/mol
Cl₂ 之鍵能(Bond energy):239 kJ/mol
Na 之昇華焓(Enthalpy of sublimation):109 kJ/mol