Calculate the energy change for the alternative reaction that yields chlorine sodide (Cl+Na-) . 2Na(s) +Cl2 (g) yeilds 2Cl+Na+(s) Assume that the lattice energy for Cl+Na- is the same as that for Na+Cl- The following data are needed: Eea for Na = -52.9 Eil for Cl = +1251 the heat of sublimation of Na is +107.3 kJ/mol the dissociaton energy of Cl2 is +122 kJ/mol for 1/2 Cl2 the lattice energy of Na+Cl- is 787 kj/mol.