The Third Law: Physical Chemistry

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4 Terms

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The Third Law

The Third Law: the entropy of a perfectly crystalline solid at 0K is zero

S=kBIn(W)= 0 since In(1)=0

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Residual entropy

Some solids have multiple configuration of equal energy at T=0

W>1, so S>0 at T=0. This non-zero entropy is called the residual entropy.

<p>Some solids have multiple configuration of equal energy at T=0</p><p>W&gt;1, so S&gt;0 at T=0. This non-zero entropy is called the <em>residual entropy. </em></p>
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Absolute Entropy

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