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When a solid dissolves in water, heat may be evolved or absorbed. The heat of dissolution...

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 13.20 g of Cs2SO4(s) are dissolved in 103.80 g of water, the temperature of the solution drops from 25.16 to 23.45 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.60 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.

KJ/mol

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