## Evaluation 9.3A

$\Delta S = \frac{q_{rev}}{T}$

Mariane Sanchez 1E
Posts: 57
Joined: Fri Sep 29, 2017 7:07 am

### Evaluation 9.3A

The question says: "Calculate the change in molar entropy of an ideal gas when it is compressed isothermally to one-third its initial volume." They got an answer of 9.13J/K.mol. Can someone please explain how they got that?

mayasinha1B
Posts: 70
Joined: Fri Sep 29, 2017 7:04 am

### Re: Evaluation 9.3A

Vi = 1 L
Vf = 3 L

Then use the equation delta S = R ln(Vf/Vi)

Manasvi Paudel 1A
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am

### Re: Evaluation 9.3A

When something is compressed isothermally, you use the equation qrev/T!