Question

The estimated lattice energy for is CsF2+2347kj/mol. Use the data given to calculate an overall energy change (in kilojoules per mole) for the formation of from its elements.
Ea for F = -328
E11 forCs = +375.7
E12 for Cs = +2422
Heat of sublimation for Cs = 76.1
Bond dissociation energy for F2= +158
Lattice energy for CsF= +740 .

Answer 1

You don't give any units for any of the numbers AND you have omitted the names of either the element or the compound in the written text.

Answer 2

756.9