Use Hess\' Law to calculate the lattice energy (kJ/mol) of KCl(s)with the follow

Question

Use Hess' Law to calculate the lattice energy (kJ/mol) of KCl(s)with the following data.
Lattice energy corresponds to the enthalpy change for the reaction:KCl(s) --> K+(g) + Cl -(g)
H°f (KCl)
(kJ/mol) Hsub (K)
(kJ/mol) IE (K)
(kJ/mol) BE (Cl2)
(kJ/mol) EA (Cl)
(kJ/mol) -437 90 419 242 -349
H°f (KCl)
(kJ/mol) Hsub (K)
(kJ/mol) IE (K)
(kJ/mol) BE (Cl2)
(kJ/mol) EA (Cl)
(kJ/mol) -437 90 419 242 -349
H°f (KCl)
(kJ/mol) Hsub (K)
(kJ/mol) IE (K)
(kJ/mol) BE (Cl2)
(kJ/mol) EA (Cl)
(kJ/mol) -437 90 419 242 -349

Explanation / Answer

Lattice energy = (- 437 kJ / mol )- ( 90 kJ / mol + 419kJ / mol + 242 / 2 kJ / mol ) - ( -349 kJ / mol )                       =-437 kJ / mol - ( 630 kJ / mol) + 349 kJ / mol                      = -718 kJ / mol

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