## 9.13

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

Alexia Joseph 2B
Posts: 56
Joined: Thu Jul 27, 2017 3:01 am

### 9.13

Why do we use 5/2 instead of 3/2 for the ideal diatomic gas?

Oscar Valdovinos 1I
Posts: 29
Joined: Fri Sep 29, 2017 7:05 am

### Re: 9.13

We use 5/2*R because the question says that the volume is changed from 3L to .5L so the reaction does not take place under constant volume. It does however take place under constant pressure.

Cp=5/2*R

Cv=3/2*R