1. Lon-Capa 5th HW assignment due Friday 10/21 by 5 pm.
4th Quiz due Sunday, 1023 by 10 pm. It will open Friday 10/21 at 5 pm.
(Exam 3 is Tuesday, October 25)

2. What We Want To Do…
Calculate ΔSuniv to show the overall process is spontaneous.
Show that each step (the expansion and the compression) is spontaneous.
Show that│ΔSexpansion │= │ΔScompression │; that is, the change in entropy of the system (ΔS) is a state function.

3. Expanding a Gas: 2 Steps

4. Expanding a Gas: 6 Steps

5. Expanding a Gas: Infinite Steps