## 3/2R and 5/2R

Julia Go 2L
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Joined: Sun Sep 30, 2018 12:17 am
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### 3/2R and 5/2R

Hi,

I am a little confused on calculations having to do with 3/2R. When would we use this when calculating heat capacities?

Ana Pedreros
Posts: 62
Joined: Fri Sep 28, 2018 12:19 am

### Re: 3/2R and 5/2R

This is used in monoatomic ideal gases. At constant volume the heat capacity, Cv = 3/2R, and at Constant Pressure, Cp= 5/2 R

Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

### Re: 3/2R and 5/2R

Yes, this varies because diatomic gases have a greater number of degrees of freedom compared to monoatomic gases.

Eruchi Okpara 2E
Posts: 53
Joined: Fri Sep 28, 2018 12:28 am

### Re: 3/2R and 5/2R

So how do we know when to use either 3/2R or 5/2R?

Ethan Yi 1K
Posts: 62
Joined: Fri Sep 28, 2018 12:28 am

### Re: 3/2R and 5/2R

Eruchi Okpara 2E wrote:So how do we know when to use either 3/2R or 5/2R?

as stated above, use Cv = 3/2 R at constant volume and use Cp = 5/2 R at constant pressure

almaochoa2D
Posts: 67
Joined: Fri Sep 28, 2018 12:23 am

### Re: 3/2R and 5/2R

How do you know when to assume it is a monatomic gas?

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