To measure the heat of solution of LiCl a student adds 100.0 grams of water, initially at 15.0 C to a calorimeter. She then adds 10.0 grams of solid LiCl, and stirs to dissolve. The maximum temperature reached by the solution is 35.6 C. A. Calculate the molar heat of solution for LiCl. B. What processes occur when the LiCl is dissolved? Explain which of these processes involves a larger amount of energy. Justify your answer with data.
Thermochemistry
Thermochemistry can be considered as a branch of thermodynamics that deals with the connections between warmth, work, and various types of energy, formed because of different synthetic and actual cycles. Thermochemistry describes the energy changes that occur as a result of reactions or chemical changes in a substance.
Exergonic Reaction
The term exergonic is derived from the Greek word in which ‘ergon’ means work and exergonic means ‘work outside’. Exergonic reactions releases work energy. Exergonic reactions are different from exothermic reactions, the one that releases only heat energy during the course of the reaction. So, exothermic reaction is one type of exergonic reaction. Exergonic reaction releases work energy in different forms like heat, light or sound. For example, a glow stick releases light making that an exergonic reaction and not an exothermic reaction since no heat is released. Even endothermic reactions at very high temperature are exergonic.
A) Total mass of solution = (100.0+10.0) g
Calculation of heat absorbed by the solution (assuming the specific heat of solution to be same as water):
Trending now
This is a popular solution!
Step by step
Solved in 3 steps
