A Carnot refrigerator takes heat from water at 0C and rejects ...

[burchfield96]

A Carnot refrigerator takes heat from water at 0C and rejects heat to a room at 12C. Suppose that 92.0 grams of water at 0C are converted to ice at 0C by the refrigerator.
 
  Calculate the mechanical energy that must be supplied to the refrigerator. The heat of fusion of water is 3.34  105 J/kg.

Question 2

An ideal Carnot engine operates between reservoirs having temperatures of 125C and -20C. Each cycle the heat expelled by this engine is used to melt 30.0 g of ice at 0.00C.
 
  The heat of fusion of water is 3.34  105 J/kg and the heat of vaporization of water is 2.25  106 J/kg.
  (a) How much work does this engine do each cycle?
  (b) How much heat per cycle does this engine absorb at the hot reservoir?

[Pariscourtney]

Answer to Question 1

1350 J

Answer to Question 2

(a) 5740 J (b) 15,800 J

[burchfield96]

Excellent

[upturnedfurball]

Wow, this really help