Consider the Born-Haber cycle for CaF_2 and look at the following reaction which

Question

Consider the Born-Haber cycle for CaF_2 and look at the following reaction which represents portion(s) of the cycle: Ca(s) + F_2(g) rightarrow Ca(g) + 2F^- (g) Which expression corresponds to the delta H degree for the above reaction? (subl = sublimation; EA = electron affinity; IE = ionization energy; latt = lattice; BE = bond energy) delta H degree_subl, Ca + BE_F2 + EA_F delta H degree_subl, Ca + 2EA_F delta H degree_subl, Ca + BE_F2 + 2EA_F IE_Ca + BE_F2 + 2EA_F delta H degree _subl, Ca + IE_Ca + BE_F2 + 2EA_F

Explanation / Answer

The given reaction involve following process:-

A) sublimation of Ca

B) ionisation of Ca

C) bond dissociation of F2

D) electron affinity of F

Hence Correct expression is

H°sub ca+IEca+BEf2+2EAf

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