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AnnaYan_1l wrote:Molecules that are perfectly ordered have no entropy at 0K (ex. CH4). For molecules that are not perfectly ordered, there is positional/residual entropy at 0K.
Expanding on this, molecules that possess residual energy maintain some sort of entropy through positional, rather than kinetic or thermal-related entropy. This can occur from a molecule being asymmetrical in structure, or even just unorganized (not a perfect crystal structure), and derive entropy from their degeneracy. We have an equation to calculate this value: , where W=degeneracy of the sample. This makes entropy easy to calculate for simple molecules smaller systems, but near to impossible for very complex molecules in very large systems.
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