Answer to Question #30020 in Molecular Physics | Thermodynamics for Lina

Question

I've tried them, I just cannot get it and I have a test tomorrow. Please help?

1) A 2.0 kg piece of ice at 0 degrees Celsius melts in a tub and the resulting water comes to room temperature at 20 degrees Celsius. How much heat did the ice absorb from its surroundings?

2) A tray containing 0.250 kg of water at 20 degrees Celsius is put into a refrigerator. How much hear must the refrigerator remove from the water to turn it into ice at 0 degrees Celsius.

3) If 1 kg of water at 20 degrees Celsius is mixed with 2 kg of water at 50 degrees Celsius, what will be the final temperature of the mixture?