Why does the solution feel warm when a small amount of water is added to solid copper(II) sulfate anhydrous to make a solution?

Hydrogen bonding occurs between the solute and the solvent, releasing energy.

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Energy is released as the water molecules bond to the ionic solid, forming a hydrated molecule.

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Energy is released as the solute ions interact with the solvent.

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Energy must be added to the system to make the ionic solid dissolve.

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Solution

The correct option is A Hydrogen bonding occurs between the solute and the solvent, releasing energy.
$C u S O_{4} + 5 H_{2} O \to C u S O_{4} .5 H_{2} O$
The product is copper sulfate pentahydrate(blue vitrol). Due to the formation of $C u S O_{4} .5 H_{2} O$ , hydrogen bonding occurs between the solute $C u S O_{4}$ and the solvent $H_{2} O$ which results in release of energy.

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