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When a mole of crystalline sodium chlori...

When a mole of crystalline sodium chloride is prepared, `410 kJ` of heat is produced. The heat of sublimation of sodium metal is `180.8kJ`. The heat of dissociation fo chloride gas into atoms is `242.7kJ`. The ionisation energy of `Na` and electron affinity of `CI` are `493.kJ` and `-368.2 kJ`, respectively. calculate the lattice enegry of `NaCI`.

Text Solution

Verified by Experts

Applying the equation
`-Q=DeltaH_(sub)+(1)/(2)D+IP-EA+U`
and substituting the respective values,
`-410=108.8+(1)/(2)xx242.7+493.7-368.2+U`
`U=-765.65kJ" "mol^(-1)`
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