Question
Define lattice enthalpy.
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Answer
Lattice enthalpy of an ionic solid is defined as the energy required to completely separate one mole of solid ionic compound into the gaseous components.
Note: Lattice enthalpy values of some ionic compounds:
Note: Lattice enthalpy values of some ionic compounds:
| Compound | Lattice enthalpy $kJ \ mol^{-1}$ |
| $LiCl$ | $853$ |
| $NaCl$ | $788$ |
| $BeF_2$ | $3020$ |
| $CaCl_2$ | $2258$ |
| $AlCl_3$ | $5492$ |
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