When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.16 g of CaBr₂(s) are dissolved in 116.80 g of water, the temperature of the solution increases from 22.79 to 25.10 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.84 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of CaBr₂(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. AH dissolution= kJ/mol Thermometer Cardboard or Styrofoam lid Nested Styrofoam cups -Reaction occurs in solution.
When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution (dissolving) can be determined using a coffee cup calorimeter. In the laboratory a general chemistry student finds that when 2.16 g of CaBr₂(s) are dissolved in 116.80 g of water, the temperature of the solution increases from 22.79 to 25.10 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.84 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of CaBr₂(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. AH dissolution= kJ/mol Thermometer Cardboard or Styrofoam lid Nested Styrofoam cups -Reaction occurs in solution.
General Chemistry - Standalone book (MindTap Course List)
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Chapter6: Thermochemisty
Section: Chapter Questions
Problem 6.109QP: A 21.3-mL sample of 0.977 M NaOH is mixed with 29.5 mL of 0.918 M HCl in a coffee-cup calorimeter...
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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.
Question
Transcribed Image Text:When a solid dissolves in water, heat may be evolved or absorbed. The heat of
dissolution (dissolving) can be determined using a coffee cup calorimeter.
In the laboratory a general chemistry student finds that when 2.16 g of CaBr₂(s) are
dissolved in 116.80 g of water, the temperature of the solution increases from 22.79
to 25.10 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter
constant) was determined in a separate experiment to be 1.84 J/°C.
Based on the student's observation, calculate the enthalpy of dissolution of CaBr₂(s) in
kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
kJ/mol
AH dissolution
=
BrookaCo, Cengage Leaming
Thermometer
Cardboard or
Styrofoam lid
Nested
Styrofoam cups
Reaction
occurs in
solution.
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