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Answers
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The third law of thermodynamics states that the entropy of a system at absolute zero is a well-defined constant. This is because a system at zero temperature exists in its ground state, so that its entropy is determined only by the degeneracy of the ground state
Limitations:
1) Glassy solids even at 0oK has entropy greater than zero.
(2) Solids having mixtures of isotopes do not have zero entropy at 0oK. For instance, entropy of solid chlorine is not zero at 0oK.
(3) Crystals of CO, N2O, NO, H2O, etc. do not have perfect order even at 0oK thus their entropy is not equal to zero.
Importance:It provides the basis for the calculation of absolute entropy of the substances. The Importance of third law of thermodynamics is given below: ... It is helpful to measure the chemical affinity. It explains the behavior of the solids at very low temperature.
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