Consider the entropy changes that occur during the Carnot cycle sketched in Figure 16.30....

Consider the entropy changes that occur during the Carnot cycle sketched in Figure 16.30. For each stage of the cycle, is the entropy change of the engine positive, negative, or zero? What is the total entropy change of the engine, and of the environment, during one complete cycle?

Figure 16.30 An example of a thermodynamically reversible heat engine. This engine uses a cyclic process called a Carnot cycle. A The work done during a Carnot cycle is equal to the area enclosed in the P-V diagram. B The four steps in the Carnot cycle.