## Ideal Gas

Armani Dodson 1A
Posts: 24
Joined: Fri Jul 22, 2016 3:00 am

### Ideal Gas

I was doing problems in the book and I do not get how they get the ( 5/2)R and (3/2)R ....... I know that R is the gas constant, but how do they get the coefficients

Claudette_Contr_3I
Posts: 23
Joined: Wed Sep 21, 2016 2:57 pm

### Re: Ideal Gas

My TA explained that the 2/3 coefficient stood for the internal energy units "per molecule of ideal gas" but I don't know about the 5/2 coefficient. Hope this is useful.

Amy Ko 3C
Posts: 24
Joined: Sat Jul 09, 2016 3:00 am

### Re: Ideal Gas

You use different C for ΔS = nC ln (T2/T1)
When it's given constant volume, you use 3/2R. Under constant pressure, you use 5/2R
This can be found in "Constants and Equations Used in Chem, Biochem, and Physics" section of the laminated periodic table.

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