[Turkishee]

I have a question which I must do yet I cant manage to solve it, any help will be appreciated.

It would be theoretically possible for calcium to forma  fluoride CaF containing Ca+ ions and the F- ions in equal numbers. Assuming that the lattice enthalpy of the hypothetical compound is similar to that of NaF (+891 kJ mol ^ -1 ), use a Born-Haber cycle to calculate its enthalpy of formation using the data below

Data:

Enthalpy of atomisation of Ca : +193 kJ Mol ^ -1
F-F Bond enthalpy : +158
First Ionisation Energy of Ca: + 590
Electron Affinity of Flourine: -348

The enthalpy of formation of CaF2 is -1214 kJ mol ^ -1. Use this to explain why it is not possible to produce CaF even if two moles of calcium are reacted with one mole of flourine gas.

[Donaldson Tan]

construct the bon-haber cycle for CaF to find the heat of formation for CaF.

then compare the heat formation for CaF to that of CaF₂