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State third law of thermodynamics. Give ...

State third law of thermodynamics. Give 'two' uses.

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It states that the entropy of a perfectly ordered crystalline substance is zero at absolute zero temperature.
Thus, S = 0 at T = 0 for any perfectly ordered crystalline substance.
Usefulness :
(a) It helps in calculating thermodynamic properties and chemical affinity.
(b) It is used to determine the absolute entropy of any substance either in solid, liquid or gaseous at any desired temperature.
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GURUKUL PUBLICATION - MAHARASHTRA PREVIOUS YEAR PAPERS- FEBRUARY 2018-CHEMISTRY (SECTION -II)
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