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Q: Which thermodynamics law defines entropy?
  • A. Zero
  • B. First
  • C. Second
  • D. Third
Correct Answer: Option C - Entropy, the measure of a system thermal energy per unit temperature that is available for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.
C. Entropy, the measure of a system thermal energy per unit temperature that is available for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.

Explanations:

Entropy, the measure of a system thermal energy per unit temperature that is available for doing useful work. Because work is obtained from ordered molecular motion, the amount of entropy is also a measure of the molecular disorder, or randomness, of a system.