Final answer:
The dissolution of LiCl in water and the temperature rise from 18.2°C to 22.9°C suggests an exothermic dissolution process in thermochemistry, related to high school chemistry.
Step-by-step explanation:
The question deals with the dissolution of Lithium Chloride (LiCl) in water and the resulting temperature change, which is a concept in thermochemistry. When a solute dissolves in a solvent, it can either absorb heat from the water, resulting in a temperature decrease (endothermic) or release heat to the water, causing the temperature to increase (exothermic). The observed temperature increase from 18.2°C to 22.9°C in this scenario indicates that the dissolution of LiCl in water is an exothermic process. To calculate the heat involved in the process, one would need to know the specific heat capacity of the solution, which is often assumed to be similar to that of pure water (4.18 J/g°C) if the solution is not very concentrated.