# Question 1. Enthalpy of Solution of a Salt in Water The chan

Question

1. Enthalpy of Solution of a Salt in Water
The change in temperature of a solution of water (22.6�C) and 5.000g of NH4Cl mixed together in a calorimeter at an initial temperature of 22.6�C. According to extrapolation, the temperature at the moment of mixing was 17.6�C.
The change in temperature of a solution of water (23.2�C) and 5.000g of NaA mixed together in a calorimeter at an initial temperature of 23.2�C. According to extrapolation, the temperature at the moment of mixing was 27.1�C.
Heat capacities of both the acid and base solutions are equal to that of water, 4.18 J g-1 K-1, and that the density of each of the solutions is 1.00 g mL-1. All liquids are at 50 mL
a) Calculate the total heat qp absorbed or released in the dissolution (the heat change for the water plus the heat change for the salt plus the heat change for the calorimeter).
b) Calculate the number of moles of salt dissolved.
c) Calculate the enthalpy of solution of the salt in kJ mol-1.

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