Question 1
A vessel containing 10 kg of water is left out where it evaporates. If the temperature remains constant at 20°C, what is the change in entropy (in kcal/K)? (The latent heat of vaporization at 20°C is 585 cal/g.)
◦
30
◦
10
◦
20
◦
40
◦
290
Question 2
A vessel containing 5.0 kg of water at 10°C is put into a refrigerator. The 1/7 HP motor (1 HP = 746 W) runs for 5.0 minutes to cool the liquid to the refrigerator's low temperature, 0°C. What is the κ of the refrigerator?
◦
5.7
◦
4.6
◦
6.5
◦
7.2
◦
3.6