## 9.13

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

Gabriela Carrillo 1B
Posts: 53
Joined: Fri Sep 29, 2017 7:04 am

### 9.13

Where did 1 mol come from? It is not stated in the question, when it is said to assume ideal behavior and we are not given moles does that mean we assume it is 1 mol??

Ashin_Jose_1H
Posts: 51
Joined: Fri Sep 29, 2017 7:04 am

### Re: 9.13

As a substance enters gas phase, the molecules are so far apart that their interactions are basically insignificant; their intermolecular interactions are negligible. Therefore under ideal behavior, we can assume that it is one mole of a gas.

Nora 1F
Posts: 46
Joined: Fri Sep 29, 2017 7:04 am

### Re: 9.13

Yes, I think that in this case because it says assume ideal behavior and you are not given an amount of moles, you assume you have one mole of N2 gas.

Ivy Lu 1C
Posts: 54
Joined: Thu Jul 27, 2017 3:00 am

### Re: 9.13

The question says to assume ideal gas behavior, but no moles of gas are given, so it's safe assume that there's only one mole of N2 gas to make the calculations easier.