## U = 3/2 nRT

Nicole Anisgard Parra 2H
Posts: 39
Joined: Sat Jul 22, 2017 3:01 am

### U = 3/2 nRT

I am a little confused as to when we would utilize this equation. It is present on the constants and equations sheet as calculating U for an ideal gas. I remember using it in 8.103, with the problem involving calculations of molar kinetic energy in j/mol for krypton at 55.85 degrees and 54.85 degrees, is this the only application of it we would see? (Calculating molar kinetic energy)

Andy Nguyen 1A
Posts: 56
Joined: Thu Jul 27, 2017 3:00 am

### Re: U = 3/2 nRT

I think that would be one of the only instances to use it. Dr. Lavelle has also used it to show that deltaU is 0 during isothermic processes, but I don't think we will use the equation too much.

Luis De La Cruz 1H
Posts: 37
Joined: Fri Sep 25, 2015 3:00 am

### Re: U = 3/2 nRT

As stated above, I don't think we will use this equation too often for this class, but it is present on the equation sheet, because you can get some useful information. From the relationship the equation describes, you can see that U, which is internal energy depends solely on T, which is temperature because n and R are constants.

Warda Sahib 2J
Posts: 29
Joined: Thu Jul 13, 2017 3:00 am

### Re: U = 3/2 nRT

I don't think you will have to answer a question using that equation, but like the answer above states, it's helpful to see the relationship between U and T (the only nonconstants in the equation).