Its molecular weight is 110.98 g/mol and its melting point is 772 C. The heat energy released when new bonds are made between the ions and water molecules is known as the hydration enthalpy of the ion. We can write the energy of such a system asÄ®=N_AM \frac$ structure has a much larger Madelung constant than the NaCl one, enough to overcome the charge differences, and thus it has a higher lattice energy. Calculate the lattice enthalpy of CaCl2, given that the enthalpy of (i) sublimation of Ca is 121 kJ/mol (ii) dissociation of Cl2 to Cl is 242. Calcium chloride, CaCl2, is a typical ionic halide and is a solid at room temperature. As the hydration energies of calcium ions
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