In an insulated container, 0.50 kg of water at 80C is mixed with 0.050 kg of ice at 5. After a while, all the ice melts, leaving only the water. Find...

In an insulated container, 0.50 kg of water at 80∘C is mixed with 0.050 kg of ice at −5.0∘C. After a while, all the ice melts, leaving only the water. Find the final temperature Tf of the water. The freezing point of water is 0∘C.