Page 1 of 1

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?