## Entropy

Volume: $\Delta S = nR\ln \frac{V_{2}}{V_{1}}$
Temperature: $\Delta S = nC\ln \frac{T_{2}}{T_{1}}$

Tiffany Lin 2E
Posts: 27
Joined: Fri Sep 25, 2015 3:00 am

### Entropy

What is residual entropy? and how do we calculate it?

Chem_Mod
Posts: 19135
Joined: Thu Aug 04, 2011 1:53 pm
Has upvoted: 820 times

### Re: Entropy

Residual entropy is the entropy that is still left when something is cooled all the way down to 0 K. Since there would be no more kinetic motion, the residual entropy is the disorder of positions. You will not need to calculate it but just understand conceptually (for example, an unsymmetric molecule has more residual entropy than a symmetric molecule)

Posts: 11
Joined: Fri Sep 25, 2015 3:00 am

### Re: Entropy

Well, the "glossary definition" of residual entropy is:
The nonzero entropy t T=0 in certain systems, which is due to a surviving disorder in the orientation of molecules.

chemgal4L
Posts: 19
Joined: Fri Sep 25, 2015 3:00 am

### Re: Entropy

What kind of problems require the use of residual entropy?