The overall energy involved in the formation of cscl from cs(s) and cl2(g) is −443 kj/mol. given the following information: heat of sublimation for cs is +76 kj/mol, bond dissociation energy for 12cl2 is +121 kj/mol, ei1 for cs is +376 kj/mol, and eea for cl(g) is −349 kj/mol. what is the magnitude of the lattice energy for cscl?

Answer :  The magnitude of the lattice energy for CsCl is, 667 KJ/mole

Explanation :

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

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

= sublimation energy of calcium

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

= ionization energy of calcium

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

= dissociation energy of chlorine

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

= electron affinity energy of chlorine

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

= lattice energy of calcium chloride

To calculate the overall energy from the born-Haber cycle, the equation used will be:

Now put all the given values in this equation, we get:

The negative sign indicates that for exothermic reaction, the lattice energy will be negative.

Therefore, the magnitude of the lattice energy for CsCl is, 667 KJ/mole

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