3/2R and 5/2R

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Julia Go 2L
Posts: 60
Joined: Sun Sep 30, 2018 12:17 am
Been upvoted: 1 time

3/2R and 5/2R

Postby Julia Go 2L » Sat Feb 09, 2019 3:53 pm

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

Postby Ana Pedreros » Sat Feb 09, 2019 4:02 pm

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

MadelynNguyen1F
Posts: 59
Joined: Fri Apr 06, 2018 11:04 am

Re: 3/2R and 5/2R

Postby MadelynNguyen1F » Sat Feb 09, 2019 4:48 pm

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

Postby Eruchi Okpara 2E » Sat Feb 09, 2019 11:03 pm

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

Postby Ethan Yi 1K » Sat Feb 09, 2019 11:07 pm

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

Postby almaochoa2D » Sun Feb 10, 2019 3:39 pm

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


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