A student investigates the thermodynamics of dissolving salts by adding \(0.050\text{ mol}\) of four different anhydrous ionic compounds to separate, insulated calorimeters each containing \(100.0\text{ g}\) of distilled water. In each trial, the mixture is stirred until the salt completely dissolves, and the temperature is recorded. The data are shown in the table below.

Salt	Initial temperature (\(^\circ\text{C}\))	Final temperature (\(^\circ\text{C}\))
\(\text{LiCl}(s)\)	\(22.0\)	\(26.4\)
\(\text{NH}_4\text{NO}_3(s)\)	\(22.0\)	\(18.3\)
\(\text{CaCl}_2(s)\)	\(22.0\)	\(31.8\)
\(\text{KCl}(s)\)	\(22.0\)	\(19.9\)

Which of the following claims about the dissolution process is best supported by the data?