Silver nitrate has lattice energy of - 820kj/mol and a heat of solution of + 22.6 kj/mol. calculate the heat of hydration for silver nitrate

Lattice energy = - 820 kJ/mole

Heat of solution = + 22.6 KJ/mole

Lattice breakdown is and endothermic reaction during the formation of solution

And hydration is an exothermic reaction as ions interact with solvent molecules

By using the formula,

Enthalpy of solution = Lattice energy + hydration energy

Now put the values and calculate,

+22.6 kj/mole = + 820 kj/mole + hydration energy

Hydration energy = 22.6 Kj/mole - 820 Kj/mole

Hydration energy = - 797.4 Kj/mole