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  4. At absolute zero, the entropy of a pure crystal is zero. This is

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Q. At absolute zero, the entropy of a pure crystal is zero. This is

Thermodynamics

Solution:

The third law of thermodynamics states that, "The entropy of a perfectly crystalline substance at zero $K$ or absolute zero is taken to be zero".
$\Delta S =\int\limits_{0}^{ T } C _{ p } d \ln T =2.303 \int\limits_{0}^{ T } C _{ p } d \log T$
where, $C _{ p }=$ heat capacities and $T =$ temperature between o $K$ and $T K$.