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Entropy

Find the change in entropy if 72.5 g of aluminum, originally at 225oC, is melted. (HINT look up the melting point of aluminum)
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.
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.