8)The lattice enthalpy of potassium chloride, (triangle)H° for KCI(s) + K+ (g) + Cl-(g)

is 717 kJ/mol; the heat of solution in making up 1 M KCl(aq) is +18.0 kJ/mol.

From these data, obtain the sum of the heats of hydration of K+ and Cl-

That is, obtain the sum of (triangle)H° values for

K+ (g)—>K+ (aq)
CI- (g)—> Cl- (aq)

(Triangle)H =kJ/mol

If the heat of hydration of CI- is-338 kJ/mol, what is the heat of hydration of K+?

Heat of hydration=kJ/ mol