If heat transfers from the system (solute) to the surroundings (solvent), then AH is negative (AH < 0), and the reaction is defined as * (T)

A)endothermic
B)exothermic

B) exothermic.

Explanation:

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In this case, we need to keep in mind that exothermic reactions release heat, so they increase the temperature as the final energy is less than the initial energy; in contrast, endothermic reactions absorb heat, so they decrease the temperature as the final energy is greater than the initial energy.

In such a way, when a dissolution process shows off a negative enthalpy of dissolution, we infer it is an exothermic process due to the aforementioned; therefore, the answer is:

B) exothermic .

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