Calculate the net energy change in kilojoules per mole that takes place on formation of

[John C.T. Reynold]

from the elements:? K(s)+ 1/2 F2--->KF (s)

The following information is needed:
Heat of sublimation for K(s)=89.2 kj/mol ;E for F(g)=-328 kj/mol
Bond dissociation energy for F2(g) for 158 kj/mol; E for K(g)=418.8 kj/mol
Electrostatic interactions in KF(s) =-821 kj/mol