Question

Write the born-haber cycle for the formation of cacl2

Answer 1

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Answer 2

Answer :

The steps involved in the born-Haber cycle for the formation of $CaCl_2$ :

(1) Conversion of solid calcium into gaseous calcium atoms.

$Ca(s)\overset{\Delta H_s}\rightarrow Ca(g)$

$\Delta H_s$ = sublimation energy of calcium

(2) Conversion of gaseous calcium atoms into gaseous calcium ions.

$Ca(g)\overset{\Delta H_I}\rightarrow Ca^{2+}(g)$

$\Delta H_I$ = ionization energy of calcium

(3) Conversion of molecular gaseous chlorine into gaseous chlorine atoms.

$Cl_2(g)\overset{\frac{1}{2}\Delta H_D}\rightarrow Cl(g)$

$\Delta H_D$ = dissociation energy of chlorine

(4) Conversion of gaseous chlorine atoms into gaseous chlorine ions.

$Cl(g)\overset{\Delta H_E}\rightarrow Cl^-(g)$

$\Delta H_E$ = electron affinity energy of chlorine

(5) Conversion of gaseous cations and gaseous anion into solid calcium chloride.

$Ca^{2+}(g)+Cl^-(g)\overset{\Delta H_L}\rightarrow CaCl_2(s)$

$\Delta H_L$ = lattice energy of calcium chloride