KCI(S)→→ K+ (aq) + CI (aq) Solid KCI dissolves as shown in the above equation. A 6.00 g sample of KCI was dissolved in 51.4 g of water. The initial temperature of the water was 20.40°C. After the compound dissolved, the temperature of the water was 11.30°C. Assume the heat was completely absorbed from the water and no heat was absorbed by the reaction container or the surroundings. Calculate the heat of solution of KCI in kJ/mol. The specific heat of water is 4.184 J/g.°C. (Do not take the added mass of the KCI into account when calculating q for the solution.) AH soln= kJ/mol
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.
![KCI(s)→→ K+ (aq) + Cl¯ (aq)
Solid KCI dissolves as shown in the above equation. A 6.00 g sample of KCI was dissolved in 51.4 g of water. The initial temperature of the water was 20.40°C. After the compound dissolved, the temperature of the water was 11.30°C.
Assume the heat was completely absorbed from the water and no heat was absorbed by the reaction container or the surroundings. Calculate the heat of solution of KCI in kJ/mol. The specific heat of water is 4.184 J/g.°C. (Do not
take the added mass of the KCI into account when calculating q for the solution.)
AH soln =
kJ/mol](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F1ca2b2e2-412c-4f12-8bdf-9b458afbcb62%2F05f5f256-434c-4578-a670-a2dd90d74314%2Fpsuvd6b_processed.png&w=3840&q=75)
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