A 4 kg iron block initially at 300oC is dropped into an insulated tank that contains 80

Question:

A 4 kg iron block initially at 300oC is dropped into an insulated tank that contains 80 kg of water at 25oC. Assuming the water that vaporizes during this process condenses back in the tank and the surroundings are at 20oC and 100 kPa. Determine
(a) The final equilibrium temperature (Tf),
(b) The energy (Φ) of the combined system at initial and final states and