13. a) The lattice enthalpy of an ionic compound can be calculated using a Born-Haber cycle. Using lithium fluoride as the example, construct a Born-Haber cycle, labeling the cycle with the formula and state symbols of the species present at each stage. [6 marks] b) Two values of lattice enthalpies for each of the silver halides are quoted below. Discuss the bonding in silver fluoride and in silver iodide, with reference to these values. [2 marks] AgF Ag! AH lattice (kJ mol-) 974 892