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 0.90 g of CaCl2(s) are dissolved in 102.10 g of water, the temperature of the solution increases from 22.90 to 24.48 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.79 J/°C.
Based on the student's observation, calculate the enthalpy of dissolution of CaCl2(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.
ΔHdissolution = kJ/mol
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