If T = 0, can residual entropy still exist?

Boltzmann Equation for Entropy:

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Michael_Johanis_2K
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If T = 0, can residual entropy still exist?

Postby Michael_Johanis_2K » Tue Jan 24, 2017 8:56 pm

If T = 0, there is no thermal entropy, correct?

If T = 0, is there residual (positional) entropy? I think that if W > 1, then there is residual entropy, even if T = 0, correct?

Chem_Mod
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Re: If T = 0, can residual entropy still exist?

Postby Chem_Mod » Tue Jan 24, 2017 10:01 pm

Yes, due to the multiple configurations of a molecule that is a non perfect crystal (because the Third Law applies to pure, perfect crystalline substances). Such as for Carbon Monoxide, it is possible for the crystal to be formed as CO:CO:CO rather than CO:OC:CO thus there is an entropy associated with this imperfection at or near zero kelvin, residual entropy.


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