Calculate the lattice energy of KCL crystal from the following data

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Calculate the lattice energy of KCL crystal from the following data

Sublimation enthalpy of pottasium (K) = +89 kJ mol-1
Dissociation enthalpy of = +122 kJ mol-1
Ionisation enthalpy of K(g) +425 kJ mol-1
Electron gain enthalpy of Cl(g) = -355 kJ mol-1
Enthalpy of formation of

Answer:

Using Born-Haber cycle for KCl,

Substituting the values we have,

The reverse of the above equation i.e.

Hence the lattice enthalpy of KCl = +719 kJ mol-1

 

lattice energy of kcl

Read more: Draw the molecular orbital energy diagram for oxygen molecule (O2)

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