Answer
Please see the work below.
Work Step by Step
We know that
a. After the water is placed into the freezer, it will lose heat to the freezer, hence $q_{sys}$ is negative.
b. The water will have turned to ice.
c. The initial anthalpy of the water is higher as compared to the final enthalpy of the ice.
d. After several hours, the temperature of the water will be $-20C^{\circ}$.
