The accompanying diagram shows how entropy varies with...

The accompanying diagram shows how entropy varies with temperature for a substance that is a gas at the highest temperature shown. (a) What processes correspond to the entropy increases along the vertical lines labeled 1 and 2 ? (b) Why is the entropy change for 2 larger than that for $1 ?$ [Section 19.3 ]

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Key Concepts

Molecular Disorder in Phase Changes

The magnitude of the entropy change in a phase transition is influenced by the change in molecular order. Transitions to a gaseous state, which has much higher randomness than the condensed phases, involve a larger increase in entropy compared to transitions between more ordered phases like solids and liquids.

Latent Heat

Latent heat is the energy absorbed or released during a phase change at a constant temperature. The entropy change during such transitions is given by the ratio of the latent heat to the transition temperature, with larger latent heats generally producing greater entropy increases.

Entropy

Entropy is a thermodynamic quantity that measures the degree of disorder or the number of microstates available to a system. In processes where energy is absorbed or released without a change in temperature, entropy may change abruptly due to the latent heat associated with a phase transition.

Phase Transitions

Phase transitions are changes of state (such as from solid to liquid or liquid to gas) that often occur at a constant temperature. In first?order phase transitions, there is an abrupt change in entropy as energy, in the form of latent heat, is absorbed or released, reflecting the substantial change in molecular arrangement and disorder.

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