When a solid dissolves in water, the solution may become hotter or colder. The dissolution enthalpy (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 17.83 g Bacl,(s) is dissolved in 104.00 g water, the temperature of the solution increases from 23.57 to 26.51 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.83 J/°C. Based on the student's observation, calculate the dissolution enthalpy of BaCl,(s) in kJ/mol. Assume the specific heat capacity of the solution is equal to the specific heat capacity of water. AdisH 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.
![When a solid dissolves in water, the solution may become hotter or colder. The dissolution enthalpy (dissolving) can be determined using a coffee
cup calorimeter.
In the laboratory a general chemistry student finds that when 17.83 g Bacl, (s) is dissolved in 104.00 g water, the temperature of the solution
increases from 23.57 to 26.51 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.83 J/°C.
Based on the student's observation, calculate the dissolution enthalpy of BaCl2(s) in kJ/mol.
Assume the specific heat capacity of the solution is equal to the specific heat capacity of water.
AdisH
k]/mol](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2F8d455e2c-378b-4c7c-a4dd-0a72f0fec806%2Faa7e58d6-fa73-46e4-a71e-c371be21b5d7%2Fqjw3l9n_processed.jpeg&w=3840&q=75)
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