Science Homework Help

I’m studying for my Physics class and don’t understand how to answer this. Can you help me study?

1. Find the change in entropy if 72.5 g of aluminum, originally at 225oC, is melted. (HINT look up the melting point of aluminum)
2. Find the change of entropy of 2.00 mol of a monoatomic a gas if it undergoes a process from A to B where TB=TA/2, and VB=3VA.
3. A freezer is a Carnot Refrigerator that makes ice at -4.00oC. Its coefficient of performance is 5.50. Also: 220.0 J of heat is extracted from the freezer every cycle.
    (a) What is the room temperature outside the freezer?  
    (b) How much work does the freezer do in a cycle?
    (c) How much energy is delivered to the room every cycle.