Question
GeneralGeneralGeneral

Using given thermodynamic data, calculate lattice energy of NaCl.

Verified Answer

Solution:

Lattice energy is calculated using the Born-Haber cycle:

Lattice Energy = ΔHf − (other energy terms)

General formula:

U = ΔHsub + IE + 1/2 D + EA − ΔHf

Where:

  • ΔHsub = Sublimation energy
  • IE = Ionization energy
  • D = Bond dissociation energy
  • EA = Electron affinity
  • ΔHf = Enthalpy of formation

Substitute the given values into the formula and calculate the lattice energy.

Answer: Lattice energy of NaCl is approximately 787 kJ mol−1.