## 9.7

$\Delta S = \frac{q_{rev}}{T}$

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Esin Gumustekin 2J
Posts: 57
Joined: Thu Jul 27, 2017 3:01 am

### 9.7

Does anyone understand the equation Cp=5/2R? It is used in this problem and I don't understand what this equation is and why we need to use it for this problem.

Thanks!

Riya Pathare 2E
Posts: 74
Joined: Sat Jul 22, 2017 3:01 am
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### Re: 9.7

This gives us the heat capacity for an ideal gas at constant pressure so we use it so we can plug it into our entropy equation to solve.

Cali Rauk1D
Posts: 51
Joined: Fri Sep 29, 2017 7:03 am

### Re: 9.7

how do you know when you are suppose to use the fractions?

skalvakota2H
Posts: 52
Joined: Sat Jul 22, 2017 3:01 am

### Re: 9.7

We can substitute the expressions for the heat capacities at both constant volume and pressure if we are aware of the molecular complexity. This means classifying the substance as monatomic, linear molecule, or nonlinear molecule.

Sarkis Sislyan 1D
Posts: 31
Joined: Thu Jul 27, 2017 3:00 am

### Re: 9.7

Also, the value of Cp as well as Cv will be given to us on exams.

Adam Enomoto 1L
Posts: 53
Joined: Fri Sep 29, 2017 7:03 am

### Re: 9.7

I’m confused about what does the fraction means

Jeremiah Samaniego 2C
Posts: 33
Joined: Fri Sep 29, 2017 7:05 am

### Re: 9.7

I don't think we have to necessarily know the details of how we get the fractions, but pages 277 and 281 in the textbook explain what those values are and how they come to be.

Shreya Ramineni 2L
Posts: 50
Joined: Fri Sep 29, 2017 7:07 am

### Re: 9.7

We just need to know that its for a monatomic ideal gas atom. The C=5/2 R is on the formula sheet if I remember correctly!

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