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 5.07 g of CsClO₄(s) are dissolved in 102.30 g of water, the temperature of the solution drops from 23.03 to 19.93 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.80 J/°C.

Based on the student's observation, calculate the enthalpy of dissolution of CsClO₄(s) in kJ/mol.

Assume the specific heat of the solution is equal to the specific heat of water.

ΔH_dissolution = kJ/mol

b.

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 11.81 g of BaBr₂(s) are dissolved in 118.40 g of water, the temperature of the solution increases from 22.63 to 24.39 °C.

The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.70 J/°C.

Based on the student's observation, calculate the enthalpy of dissolution of BaBr₂(s) in kJ/mol.

Assume the specific heat of the solution is equal to the specific heat of water.

ΔH_dissolution = kJ/mol