Thermodynamics

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Nicholas
Posts: 7
Joined: Wed Sep 21, 2016 2:58 pm

Thermodynamics

Postby Nicholas » Tue Feb 14, 2017 7:18 pm

Is residual entropy the same as positional disorder ?

Hannah_El-Sabrout_2K
Posts: 20
Joined: Wed Sep 21, 2016 2:58 pm

Re: Thermodynamics

Postby Hannah_El-Sabrout_2K » Tue Feb 14, 2017 9:07 pm

I could be wrong, but I'm pretty sure residual entropy is the entropy at T=0K. Because although the third law states that deltaS=0 at T=0K, this is theoretical and can only happen if the substance is a perfect crystal. So, in reality, there will be some entropy.

Navarro_Bree_1D
Posts: 24
Joined: Wed Sep 21, 2016 3:00 pm

Re: Thermodynamics

Postby Navarro_Bree_1D » Thu Feb 16, 2017 3:00 pm

Residual and positional entropy are the same thing. I would like to add that molar residual entropy is different than residual/positional entropy. When determining the degeneracy of molar residual entropy, the exponent used in Avogadro's constant. This makes sense because molar residual entropy represents the entropy in one mole of a certain compound.


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