One ton of liquid water at 80°C is brought into a well-insulated and well-sealed 4-m x 5-m

Question:

One ton of liquid water at 80°C is brought into a well-insulated and well-sealed 4-m x 5-m x 7-m room initially at 22°C and 100 kPa. Assuming constant specific heats for both air and water at room temperature, determine
(a) The final equilibrium temperature in the room and
(b) The total entropy change during this process, in kJ/K.

One ton of liquid water at 80°C