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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 4.56 g of NH4Cl(s) are dissolved in 116.60 g of water, the temperature of the solution drops from 24.83 to 22.08 °C. The heat capacity of the calorimeter (sometimes referred to as the calorimeter constant) was determined in a separate experiment to be 1.65 J/°C. Based on the student's observation, calculate the enthalpy of dissolution of NH4Cl(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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queen_honey_blossom answered 2 years ago
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