Question

Draw Born-Haber cycle for the calculation of lattice enthalpy of the ionic crystal NaCl.(
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Answer 1

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Answer 2

The Born Haber Cycle for NaCl is given below.

• Born Haber cycle is a cycle showing the formation of an ionic crystal from its constituent elements in their natural state.
• Enthalpy change (energy releases or absorbed) is noted for each step.
• Using  Hess's law of constant heat summation, any unknown enthalpy can be calculated if all other enthalpies are given.
• In the formation of NaCl(s), Heat of Sublimation of Na(s), 1st Ionisation Enthalpy of Na(g), Enthalpy of dissociation of 1/2Cl₂(g), Electron Gain Enthalpy of Cl(g) and Lattice enthalpy of NaCl is involved.
• Using Hess law, the enthalpy of formation of NaCl is the sum of all the above-mentioned enthalpies.