## 9.13

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Kyra LeRoy 1E
Posts: 52
Joined: Sat Jul 22, 2017 3:00 am

### 9.13

In the solutions manual, it uses 1 mol of nitrogen gas in calculations. How do we know that there is 1 mol? Is this just something we assume if not given a molar amount?

Kellina Tran 2I
Posts: 50
Joined: Sat Jul 22, 2017 3:00 am

### Re: 9.13

I’m not completely sure, but I feel like it might have something to do with it having to be in standard state because it says “Assume ideal behavior.” Someone correct me if I’m wrong

Nhan Nguyen 2F
Posts: 52
Joined: Thu Jul 13, 2017 3:00 am
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### Re: 9.13

It only states "nitrogen gas" without giving any amount of mols, so I think you can just use 1 mol for that one

204918982
Posts: 50
Joined: Fri Sep 29, 2017 7:04 am

### Re: 9.13

Yes I think that's what we are supposed to use when it says to assume ideal behavior

Rachel Formaker 1E
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Joined: Fri Sep 29, 2017 7:04 am
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### Re: 9.13

Although it does not specify 1 moleof N2 gas in the book, 9.13 is listed in the solutions manual errors on Lavelle's website. In the corrected answer, Lavelle says to assume both ideal behavior and 1 mol of N2 gas.