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JEE Mains · Chemistry · STD 11 - 5. Thermodynamics and thermochemistry

If the enthalpy of sublimation of Li is \(155~kJ~mol ^{-1}\), enthalpy of dissociation of \(F_2\) is \(150~kJ~mol ^{-1}\), ionization enthalpy of Li is \(520~kJ~mol ^{-1}\), electron gain enthalpy of F is \(-313~kJ~mol ^{-1}\), standard enthalpy of formation of LiF is \(-594 kJ mol ^{-1}\). The magnitude of lattice enthalpy of LiF is _______ \(kJ~mol ^{-1}\) (Nearest integer).

  1. A 1000
  2. B 1031
  3. C 1150
  4. D 950
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Answer & Solution

Correct Answer

(B) 1031

Step-by-step Solution

Detailed explanation

\(-594=155+520+\frac{150}{2}-313+(\) L.E. \()\) L.E. \(=-1031 kJ / mol\)
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