\Delta H_(lattice ) KBr(s)->K^(+)(g)+Br^(-)(g). K(s)->K(g),89.24k(J)/(m)ol K(g)->K^(+)(g)+e^(-),419k(J)/(m)ol Br_(2)(g)->2Br(g),193k(J)/(m)ol Br(g)+e^(-)->Br^(-)(g),-325k(J)/(m)ol K(s)+(1)/(2)Br_(2)(g)->KBr(s),-394k(J)/(m)ol