How do i solve this heat of formation and lattice energy problems?
Given: Lattice energy [AlCl3 (s)] =5376 kj/mol; change in heat of formation [Al(g)]= 326 kj/mol ; change of heat of formation [Cl (g)] = 122 kj/mol; change of heat of formation [Cl- (g)]= -233 kj/mol; change in heat of formation [AlCl3(s)]= -704 kj/mol. Calculate the heat of formation of the Al +3 gasous ion