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 In the laboratory a general chemistry student finds that when 12.65 g of BaCl2(s) are dissolved in 104.10 g of water, the temperature of the solution increases from 24.64 to 26.85 C. Cardboard or Styrofoam lid as the calorimeter constant) was determined in a separate The heat capacity of the calorimeter (sometimes referred experiment to be 1.54 J/C. Nested Styrofoam cups Based on the student's observation, calculate the enthalpy of dissolution of BaCl2(s) in kJ/mol. Reaction occurs in solution. Assume the specific heat of the solution is equal to the specific heat of water. AH dissolution = kJ/mol