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### 3/2R and 5/2R

Posted: **Sat Feb 09, 2019 3:53 pm**

by **Julia Go 2L**

Hi,

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

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

Posted: **Sat Feb 09, 2019 4:02 pm**

by **Ana Pedreros**

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

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

Posted: **Sat Feb 09, 2019 4:48 pm**

by **MadelynNguyen1F**

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

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

Posted: **Sat Feb 09, 2019 11:03 pm**

by **Eruchi Okpara 2E**

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

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

Posted: **Sat Feb 09, 2019 11:07 pm**

by **Ethan Yi 1K**

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

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

Posted: **Sun Feb 10, 2019 3:39 pm**

by **almaochoa2D**

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