Lattice Energy??? Please Help??!?!?

Question

The standard heat of formation of CaBr2 is -675 KJ/mol. The first ionization energy of Ca is 590KJ/Mol and its second ionization energy is 1145KJ/Mol. The heat of sublimation of Ca[Ca(s)---->Ca(g)] is 178 KJ/Mol. The bond energy of Br2(l) is 31 Kj/Mol, and the electron affinity of Br is -325 Kj/Mol.

Calculate the lattice energy of CaBr2??

E=? kj/mol

Answer 1

http://answers.yahoo.com/question/index?qid=20071117205613AAxA240&r=w&pa=FZptHWf.BGRX3OFMiDFQUSZrj7MHp1FcKmZnXYVOOmTMa4qPuA--&paid=answered#ErdyMEHnCDXCijxvQIZ7

Answer 2

I'm not helping you with your homework but you have to draw a Born Harber cycle diagram. It helps.