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Third law of thermodynamics

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Intro to Chemistry

Definition

The third law of thermodynamics states that the entropy of a perfect crystal at absolute zero temperature is exactly zero. This implies that it is impossible to reach absolute zero in a finite number of steps.

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5 Must Know Facts For Your Next Test

  1. Entropy approaches zero as the temperature approaches absolute zero for a perfect crystal.
  2. It is physically impossible to reach absolute zero temperature.
  3. The third law helps define the concept of absolute entropy.
  4. Residual entropy can exist in non-perfect crystals even at absolute zero due to disorder.
  5. The third law implies that as temperature decreases, the entropy change associated with any process also decreases.

Review Questions

  • What happens to the entropy of a perfect crystal at absolute zero according to the third law of thermodynamics?
  • Why is it impossible to reach absolute zero temperature?
  • How does the third law relate to the concept of residual entropy?
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