## 4F.7 - no given Cp constant?

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

Sue Bin Park 2I
Posts: 52
Joined: Mon Jun 17, 2019 7:24 am

### 4F.7 - no given Cp constant?

I know the question requires the use of deltaS = Cp*ln(T2/T1), but I'm not sure how I'm supposed to solve this without a given specific heat for the unnamed gas?

connie 2C
Posts: 106
Joined: Thu Jul 11, 2019 12:17 am

### Re: 4F.7 - no given Cp constant?

i think we are supposed to use the equations Cv=(3/2)R and Cp=(5/2)R to find the answer since it's not given.

connie 2C
Posts: 106
Joined: Thu Jul 11, 2019 12:17 am

### Re: 4F.7 - no given Cp constant?

i found these equations on the class website under the constants and equations tab^^

Benjamin Feng 1B
Posts: 102
Joined: Sat Sep 07, 2019 12:19 am

### Re: 4F.7 - no given Cp constant?

In an earlier section, they mention that you can find the Cp and Cv of an ideal gas through derivations. The values are on page 265 and 266 and should be 3/2 R and 5/2 R.