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Which of the following explains why the solution feels warm when a small amount of water is added to solid copper (II) sulfate anhydrous?
Hydrogen bonding occurs between the solute and the solvent, releasing energy.
Energy is released as the water molecules bond to the ionic solid, forming a hydrated molecule.
Energy is released as the solute ions interact with the solvent.
Energy must be added to the system to make the ionic solid dissolve.