When 3.2g of ammonium chloride is dissolved in 75g of water, the temperature of the solution decreases from 22.8 C to 20.1 C. What is the energy of dissolution of NH4Cl per mole?

Question

Chemistry

Javion Walter

12 September, 12:23

When 3.2g of ammonium chloride is dissolved in 75g of water, the temperature of the solution decreases from 22.8 C to 20.1 C. What is the energy of dissolution of NH4Cl per mole?

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Xiomara Marsh · Answer 1

Dissolving NH4Cl in H2O is an endothermic solution process. You measure how much it cools the solution by the temperature of the H2O.

q = mass H2O x specific heat H2O x (Tfinal-Tinitial)

The q you measure is for 3.2g/53.4g or q/0.0599 mol. You want to convert that to q/1 mol.