December's AP Problem

a.      When liquid water is introduced into an evacuated container

        at 25°C, some of the water vaporizes. Predict how the enthalpy,

        entropy, free energy, and temperature change in the system

        during this process. Explain the basis for each of your answers.

b.      When a large amount of ammonium chloride is added to water

        at 25C, some of it dissolves and the temperature of the system

        decreases. Predict how the enthalpy,entropy, and free energy

        change in the system during this process. Explain the basis for

        each of your answers.

c.      If the temperature of the ammonium chloride system in part b.

        were increased to 30°C, predict how the solubility of the

        ammonium chloride would be affected. Explain the basis for

        your answer.