50.0g of water (the system) at 30C is frozen to ice at a final temp of -10C in a freezer. Assuming that the volume of water remains the same during the process, calculate the change in entropy of the system and the change of entropy of the thermal universe when the system reaches thermal equilibrium.
The Attempt at a Solution
See attached image for attempt at solution. I already missed the question in class and just want to know how to properly do it at this point. Thanks.