2. A heat engine absorbs 100.0 kJ of heat from a hot reservoir at 100.0 °C and rejects 40,0 kJ of heat to a cold reservoir at 20.0 °C. Is this engine possible? Justify your answer. 

3. A 15.0 g ice cube is initially at -15.0°C. It absorbs enough heat to turn into water at 5.0° C. What is the change in entropy of the ice cube?

An inventor suggests that a house might be heated by using a refrigerator to draw energy as heat from the ground and reject energy as heat into the house. He claims that the energy supplied to the house as heat can exceed the work required to run the refrigerator. This: A) is impossible by first law. B) is impossible by second law. C) would only work if the ground and the house were at the same temperature. D) is impossible since heat energy flows from the (hot) house to the (cold) ground. E) is possible.