- We have to calculate the heat of solution when 10.6 g potassium perchlorate is dissolved in water.

**Heat of solution** is the energy absorbed or released when a solid is dissolved in a solvent to form a solution.

**The heat of solution is calculated by this formula:**

$\overline{){\mathbf{\u2206}}{\mathbf{H}}{{\mathbf{\xb0}}}_{{\mathbf{solution}}}{\mathbf{}}{\mathbf{=}}{\mathbf{}}{\mathbf{\u2206}}{\mathbf{H}}{{\mathbf{\xb0}}}_{{\mathbf{hydration}}}{\mathbf{}}{\mathbf{-}}{\mathbf{}}{\mathbf{\u2206}}{\mathbf{H}}{{\mathbf{\xb0}}}_{{\mathbf{lattice}}}}$

Potassium perchlorate (KClO_{4}) has a lattice energy of -599 kJ/mol and a heat of hydration of -548 kJ/mol.

Find the heat of solution for potassium perchlorate when 10.6 g of potassium perchlorate is dissolved with enough water to make 110.1 mL of solution.

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