With respect to I kg of liquid water;
(a) Initially at 0OC. it is heated to 100oC by contact with a heat reservoir at 100oC.
What is the entropy change of the water? Of the heat reservoir? What is (Stotal?
(b) Initially at 0oC, it is first heated to 50oC by contact with a heat reservoir at 50oC and then to 100oC by contact with a reservoir at 100oC, What is ( Stotal?
(c) Explain how the water might be heated from 0oC to 100oC so that ( Stotal = 0.