1. Studetn performs a calibration experiment to determine the heat capacity of t
ID: 499351 • Letter: 1
Question
1. Studetn performs a calibration experiment to determine the heat capacity of the calorimeter. Student mixes 25.0 mL of warm water at 41.2 C and 35.0 mL of cool water at 15.1 C. The final temp of the mixture is 19.8 C. Assume the specific heat of water is 4.184 J/g C and the density of water is 1.00 g/mL. Calculate the heat capacity of the calorimeter.
2. A sample of MgSO4 is dissolved in 50.0 mL of distilled water in a calorimeter with a heat capacity of 35.3 J/C. The temperature of the solution increased from 21.3 C to 23.7 C. Calculate the heat released (or absorbed) during this dissolution process.
3. An endothermic reaction involving the dissolution of 1.367 g of compound X in water absorbed 34.6 kJ of heat energy. Calculate the molar enthalpy of solution of compound X. (The molar mass of compound X is 146.32 g/mol)
Explanation / Answer
Total volume of the mixture = 25mL + 35mL = 60mL
Mass of the mixture = 60mL * 1gm/mL = 60gm
Heat liberated by the warm water = 25 gm * 4.184J/g/oC * (41.2-19.8) = 2238.44 J
heat absorbed by the mixture = 60gm * 4.184J/g/oC *(19.8-15.1) = 1179.89 J
Heat absorbed by the calorimeter =2238.44 J- 1179.89 J
Heat capacity = (2238.44 J- 1179.89 J )/(19.8-15.1) = 225.2 J/oC
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