Explain why the entropy of a pure crystalline substance is zero at 0K ? State the law on which it is based. Give the application of this law ?
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The “third law of thermodynamics” states that “a system’s entropy becomes constant when the system temperature becomes absolute zero”.
The Third Law states, The “entropy” of a “perfect crystal” is “zero” when the crystal’s temperature is equal to “absolute zero”.
The crystal must be “perfect” or an “inherent disorder” will exist. It must also be at “0 K”, otherwise the thermal motion inside the crystal will lead to disorder.
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