Question

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 18.53 g of Cs₂SO₄(s) are dissolved in 100.40 g of water, the temperature of the solution drops from 25.54 to 22.92 °C.
The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.85 J/°C.
Based on the student's observation, calculate the enthalpy of dissolution of Cs₂SO₄(s) in kJ/mol.
Assume the specific heat of the solution is equal to the specific heat of water.