The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. (c) If this substance is a perfect crystal at T = 0 K, what is the value of S at this temperature?

검증된 단계별 안내

Identify the concept of entropy (S) and its relation to temperature. Entropy is a measure of the disorder or randomness in a system.

Recall the Third Law of Thermodynamics, which states that the entropy of a perfect crystal at absolute zero (0 K) is exactly zero.

Understand that a perfect crystal is a substance with a perfectly ordered structure, meaning there is only one possible microstate.

Apply the Third Law to the given problem: since the substance is a perfect crystal at T = 0 K, the entropy S at this temperature is zero.

Conclude that the value of S at T = 0 K for a perfect crystal is 0 J/K.

비슷한 문제에 대한 검증된 영상 답변:

이 영상 해법은 위 문제에 도움이 된다고 튜터들이 추천한 것입니다.

영상 길이:

주요 개념

질문에 올바르게 답하기 위해 반드시 이해해야 하는 핵심 개념들은 다음과 같습니다.

Entropy

Entropy is a measure of the disorder or randomness in a system. In thermodynamics, it quantifies the number of microscopic configurations that correspond to a thermodynamic system's macroscopic state. Higher entropy indicates greater disorder, while lower entropy suggests more order. Understanding entropy is crucial for analyzing the behavior of substances at different temperatures.

Third Law of Thermodynamics

The Third Law of Thermodynamics states that as the temperature of a perfect crystal approaches absolute zero (0 K), the entropy of the crystal approaches a constant minimum, which is typically zero. This principle implies that at absolute zero, a perfect crystal has no disorder, and thus its entropy is zero. This law is fundamental in understanding the behavior of materials at low temperatures.

Temperature and Phase Changes

Temperature is a measure of the average kinetic energy of the particles in a substance. As temperature changes, substances can undergo phase changes, affecting their entropy. For gases, the entropy increases significantly with temperature due to increased molecular motion and disorder. Recognizing how temperature influences entropy is essential for interpreting thermodynamic diagrams and understanding the state of a substance.