Question

Explain Born Haber cycle with by considering example of formation of
MgCl2 as given in the chemical reaction
Mg(s) + Cl2(g) → MgCl2(s)

Answer 1

Answer:

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Answer 2

Born Haber cycle is a cycle of enthalpy change of process that leads to the formation of a solid crystalline ionic compound from the elemental atoms in their standard state and of the enthalpy of formation of the solid compound such that the net enthalpy becomes zero.

Born-Haber cycle of MgCl2 :

Mg+2Cl→MgCl2

The formation of ionic magnesium chloride from metal magnesium and chlorine gases.

Step : 1

Solid magnesium sublimes to form gaseous atoms by absorbing heat energy (ΔHsub).

Mg(s)→Mg(g)

Step : 2

Gaseous magnesium atoms absorb ionization energy to release one electron to further generate gaseous magnesium ions

Mg(g)→Mg2+

Step : 3

The diatomic chlorine gas absorbs bond dissociation energy to form gaseous chlorine atoms.

1/2Cl2→Cl(g)

Step : 4

The chlorine atom accepts two electrons to form chloride ions.

Cl(g)+2e→Cl2−(g)