Question

What does the Third Law of Thermodynamics state about the entropy of a perfect crystal at absolute zero temperature?

• A. The entropy reaches its maximum value.
• B. The entropy becomes indeterminate.
• C. The entropy approaches zero.
• D. The entropy is unaffected by temperature.

Hint:

Third Law of Thermodynamics. The entropy (S) of a perfect crystal approaches zero as the absolute temperature (T) approaches zero Kelvin. \( \lim_{T\to 0 S = 0 \).

Answer 1

The Correct Option is C

The Third Law of Thermodynamics deals with the behavior of entropy as the temperature approaches absolute zero (0 Kelvin).
It states that the entropy of a perfect crystalline substance approaches zero as the absolute temperature approaches zero.
A perfect crystal at absolute zero represents the state of minimum energy and maximum order (only one possible microstate), corresponding to zero entropy (S=0).
While reaching absolute zero is practically impossible, the law states that entropy tends towards zero as T \(\rightarrow\) 0 K.