Calcium chloride (1.14 g) is completely dissolved in 100.0 mL of water at 27.00 °C in a ‘coffee cup’ calorimeter. The temperature of the water after dissolution is 28.97 °C. What is the standard enthalpy of solution of CaCl2 (in kJ mol–1). The density of water at 27.0 °C is 0.997 g mL–1 and its heat capacity is 4.184 J K–1 g–1.

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Lulama KlaasLv10

28 Nov 2020

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Calcium chloride (1.14 g) is completely dissolved in 100.0 mL of water at 27.00 °C in a ‘coffee cup’ calorimeter. The temperature of the water after dissolution is 28.97 °C. What is the standard enthalpy of solution of CaCl2 (in kJ mol–1). The density of water at 27.0 °C is 0.997 g mL–1 and its heat capacity is 4.184 J K–1 g–1

amaranthclam982

In an experiment, when 23.6 of calcium chloride, CaCl2 were dissolved in water in a coffee-cup calorimeter (at constant pressure), the temperature rose from 25.0°C to 38.7°C. The dissolution process is: CaCl2(s) Ca2+ (aq) + 2Cl-(aq) The heat capacity of the solution and the calorimeter is 1258 J/°C. The molar mass of CaCl2 is 110.98 g/mol. What is the heat that was absorbed by the solution and calorimeter? What is the heat that was released from the dissolution of CaCl, in the experiment?