A hypothetical solution forms between a solid and a liquid. The values of the thermodynamic quantities involved in the process are shown in the following table

Question

Action
Enthalpy
separation of solute
16.5 kJ/ mol
separation of solvent
27.8 kJ/ mol
formation of solute-solvent interactions
-88.7 kJ/mol solute
Calculate the enthalpy of solution in kilojoules per mole of solute
Enter your answer numerically in kilojoules per mole of solute.

Answer 1

To calculate the enthalpy of solution, we need to consider the enthalpies of the individual actions involved in the process.

Enthalpy of solution = Enthalpy of separation of solute + Enthalpy of separation of solvent + Enthalpy of formation of solute-solvent interactions

Enthalpy of solution = 16.5 kJ/mol + 27.8 kJ/mol + (-88.7 kJ/mol)
Enthalpy of solution = -44.4 kJ/mol

Therefore, the enthalpy of solution is -44.4 kJ/mol.