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 5.25 g of K,SO,(s) are dissolved in 115.60 g of water, the temperature of the solution drops from 23.87 to 22.27 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.76 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of K,SO4(s) in kJ/mol. Assume the specific heat of the solution is equal to the specific heat of water. AHdissolution kJ/mol

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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.
Thermometer
Cardboard or
In the laboratory a general chemistry student finds that when 5.25 g of K,SO4(s) are dissolved in 115.60 g of
Styrofoam lid
water, the temperature of the solution drops from 23.87 to 22.27 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a
separate experiment to be 1.76 J/°C.
Nested
Styrofoam cups
Based on the student's observation, calculate the enthalpy of dissolution of K,SO,(s) in kJ/mol.
Reaction
Assume the specific heat of the solution is equal to the specific heat of water.
occurs in
solution.
AHdissolution
kJ/mol
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. Thermometer Cardboard or In the laboratory a general chemistry student finds that when 5.25 g of K,SO4(s) are dissolved in 115.60 g of Styrofoam lid water, the temperature of the solution drops from 23.87 to 22.27 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.76 J/°C. Nested Styrofoam cups Based on the student's observation, calculate the enthalpy of dissolution of K,SO,(s) in kJ/mol. Reaction Assume the specific heat of the solution is equal to the specific heat of water. occurs in solution. AHdissolution kJ/mol
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