The correct statements about the heat of solvation for a solution process are:
(a) The heat of solvation is the enthalpy change that occurs when a solute particle is surrounded by solvent molecules.
(d) The heat of solvation is called the heat of hydration if water is the solvent.
(e) In general, ions with greater charge densities will have more negative heats of hydration.
So, statements (a), (d), and (e) are correct.