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Vishwanath S Grade: 12
        can lattice energy be estimated by born-haber cycle? what about hydration energy and electron gain enthalpy?
6 years ago

Answers : (1)

SAGAR SINGH - IIT DELHI
879 Points
										

Dear student,


The answer is yes.


Lattice energy of ionic solids


Born Haber Cycle helps us to calculate the lattice energy of ionic solid, provided other thermodynamic data is known. For example, the lattice energy of magnesium fluoride (MgF2) can be calculated when the sublimation energy (S) of Mg = 146.4 kJ mol-1; IE1 and IE2 values of Mg=737 and 1449 kJ mol -1 respectively; Dissociation energy (D) of fluorine = 158.8 kJ mol -1; EA of fluorine = - 328 kJ mol -1 and DHf of MgF2 =- 1096.5 kJ mol 1. Born Haber Cycle for MgF2 is as shown:


Born Haber Cycle for MgF2

Born Haber Cycle for MgF2


DHf = DHs + DHd + (IE1 + IE2) + 2 EA1+ U


U = DHf - DHs - DHd - (IE1 + IE2) - 2 EA1


= -1096.5 - 146.4 - 158.8 - (737 + 1449) - 2(-328)


= -2931.7 kJmol-1









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Sagar Singh


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6 years ago
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