Lithium iodide has a lattice energy of -7.3 * 10^2 kJ/mol and a heat of hydration of -793 kJ/mol. Find the heat of solution for lithium iodide and determine how much heat is evolved or absorbed when 15.0 g of lithium iodide completely dissolves in water.

Verified step by step guidance

1. Identify the given values: Lattice energy of lithium iodide (LiI) is -730 kJ/mol and the heat of hydration is -793 kJ/mol.
2. Use the formula for the heat of solution: \( \Delta H_{solution} = \Delta H_{hydration} - \Delta H_{lattice} \).
3. Substitute the given values into the formula: \( \Delta H_{solution} = -793 \text{ kJ/mol} - (-730 \text{ kJ/mol}) \).
4. Calculate the molar mass of lithium iodide (LiI) by adding the atomic masses of lithium (Li) and iodine (I).
5. Convert 15.0 g of LiI to moles using its molar mass, then multiply the moles by the heat of solution to find the total heat evolved or absorbed.