Question

30.0 g of nh₄cl dissociates in water, resulting in the absorption of 675 j of heat. what type of energy change occurs with the dissociation of the salt? endothermic exothermic cannot be determined because the temperature change is unknown

Explanation:

To determine the energy change type, we use the definitions of endothermic and exothermic processes. An endothermic process absorbs heat from the surroundings, while an exothermic process releases heat. Here, $\ce{NH4Cl}$ dissociation absorbs 675 J of heat, so it matches the endothermic definition. The temperature change is not needed here as the heat absorption is directly stated.

Answer:

A. endothermic