The lattice enthalpy of potassium chloride is 717 kJ/mol; the heat of solution in making up 1

Question:

The lattice enthalpy of potassium chloride is 717 kJ/mol; the heat of solution in making up 1 M KCl(aq) is +18.0 kJ/mol. Using the value for the heat of hydration of Cl given in Problem 12.125, obtain the heat of hydration of K+. Compare this with the value you obtained for Na+ in Problem 12.127. Explain the relative values of Na+ and K+.