Explain why the entropy of a pure crystalline substance is zero at 0 K ?State the law on which it is based. Give the application of this law ?

Explain why the entropy of a pure crystalline substance is zero at 0 K

1.	Explain why the entropy of a pure crystalline substance is zero at 0 K ?State the law on which it is based. Give the application of this law ?
Answer» Solution :At 0 K , there is a perfectly ordered arrangement of the constituent particle of a PURE crystalline substance and there is no DISORDER at all. Hence,its ENTROPY is taken an zero. This statement is based on the third law of thermodynamics. The law is applied to FIND the absolute entropy of a substance in any STATE at any temperature.