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When a 2.00 g sample of KCl is dissolved in water in a calorimeter that has...

When a 2.00 g sample of KCl is dissolved in water in a calorimeter that has a total heat capacity of 1.538 kJ/K, the temperature decreases by 0.300 K. Calculate the molar heat of solution of KCl.

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Answer #1

Heat absorbed by water = heat capacity of calorimeter*t

                                 = 1.538*0.3 = 0.4614 kj

no of moles of KCl = weight of KCl/Gram molar mass

                            = 2/74.6 = 0.0268 moles

molar heat of KCl solution = 0.4614/0.0268 = 17.21kj/mole

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