## Problem 4F.11 7th Edition

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

Kathryn Wilhem 1I
Posts: 60
Joined: Fri Sep 28, 2018 12:27 am

### Problem 4F.11 7th Edition

Problem 4F.11 asks you to find the change in entropy when the volume changes from 3L to 0.5L and the temperature changes from 291.5K to 301.1K. When calculating delta S for the temperature change, the solutions used delta S = nRln(T2/T1). Why didn't they use delta S = nCln(T2/T1)?

Simmi Diwanji 2B
Posts: 32
Joined: Fri Sep 28, 2018 12:20 am

### Re: Problem 4F.11 7th Edition

I think it might be because they don't specify if it's a monoatomic or diatomic ideal gas? I know it says nitrogen gas which is diatomic, but maybe they just don't want you to assume so you use R?

Max Hayama 4K
Posts: 63
Joined: Fri Sep 28, 2018 12:16 am

### Re: Problem 4F.11 7th Edition

I came across this problem too. I think if it's not specified what kind of ideal gas it is, you can use the equation in the solutions manual.