Discussion
State whether the following is true or false.
The third law states that the entropy of a perfect crystal approaches zero as the temperature approaches absolute zero.
Answer: C
Correct answer: True
That is the Nernst statement of the third law. Its practical importance is that it provides an absolute zero for the entropy scale, so entropies can be tabulated as absolute values rather than as differences - unlike energy and enthalpy, which are always referred to an arbitrary datum. It also implies that absolute zero cannot be reached in any finite number of steps.
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