A mass of 10 kg of water at 0 °C is brought into contact with a large heat reservoir at 100 °C.
a. When the water has reached 100 °C what has been
- the change of entropy of the water;
- the change of entropy of the reservoir;
- the change of entropy of the universe?
b. If the water had been heated from 0 to 100 °C by first bringing it into contact with a reservoir at 30 °C and then a reservoir of 100 °C, what would have been the change in the entropy of the universe?
c. Explain how the water could have been heated to give no change in the entropy of the universe. [13.11 kJ/kg K; 11.26 kJ/kg K; 1.85 kJ/kg K; 1.070 kJ/kg K; infinite number of reservoirs]