A well insulated calorimeter contains 100 ml of water. 0.100 mol of solid potassium nitrate is added to the water and stirred until it has all dissolved. The water was initially at a temperature of 18.00 °C. After all the potassium nitrate has dissolved the temperature is 7.90 °C. The temperature change is caused by heat energy O a. lost from the calorimeter and water to the surroundings b. absorbed in the solution process O c. due to the reaction of potassium nitrate with water O d. absorbed from the surroundings into the calorimeter and water
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.
Answer:
Potassium Nitrate is an Ionic compound which has been dissolved in water and we have to find out whether this dissolution process is endothermic or exothermic.
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