## 9.13

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

Paula Sing 1J
Posts: 36
Joined: Fri Sep 29, 2017 7:06 am

### 9.13

In this question I understand that you can use delta S=nRln(V2/V1) for the first part of the problem, but how are you supposed to know to use S=nRln(T2/T1) instead of delta S=nCln(T2/T1) with the C-value calculated for constant volume?

Jessica Jones 2B
Posts: 80
Joined: Fri Sep 29, 2017 7:04 am

### Re: 9.13

for this equation in terms of temperature you always use Cp or Cv instead of R. All the other ones(Volume and Pressure) are just R.

Christy Zhao 1H
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: 9.13

Both equations are also given on the constants sheet. And the C value can be Cv at constant volume, or Cp at constant pressure.