P8.5 Are the two P-T phase diagrams shown in this probler likely to be observed for a pure substance? If not, explain al features of the diagram that will not be observed. Liquid Liquid Vapor Solid Pressure Pressure
P8.5 Are the two P-T phase diagrams shown in this probler likely to be observed for a pure substance? If not, explain al features of the diagram that will not be observed. Liquid Liquid Vapor Solid Pressure Pressure
Chemistry
10th Edition
ISBN:9781305957404
Author:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Publisher:Steven S. Zumdahl, Susan A. Zumdahl, Donald J. DeCoste
Chapter1: Chemical Foundations
Section: Chapter Questions
Problem 1RQ: Define and explain the differences between the following terms. a. law and theory b. theory and...
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
Transcribed Image Text:**P8.5** Are the two \( P \)–\( T \) phase diagrams shown in this problem likely to be observed for a pure substance? If not, explain all features of the diagram that will not be observed.
**Diagram (a):**
This \( P \)–\( T \) phase diagram is divided into three distinct regions labeled as Solid, Liquid, and Vapor. The diagram displays the typical phase boundaries:
- **Solid** area is at high pressure and low temperature.
- **Liquid** area occurs at moderate pressure and temperature.
- **Vapor** area is observed at low pressure and high temperature.
The boundaries illustrate phase transitions:
- Solid to Liquid (melting/freezing line).
- Liquid to Vapor (boiling/condensation line).
- Solid to Vapor (sublimation/deposition line).
**Diagram (b):**
This phase diagram also has three regions labeled Solid, Liquid, and Vapor but with an unusual feature:
- **Solid** area is still at low temperature but now at relatively low pressure, which is less common.
- **Liquid** area covers a wide range of temperatures.
- **Vapor** area is at higher temperatures and pressures.
The anomaly in this diagram is the broad Liquid area at high pressure, suggesting the transitions might not represent possible states for a pure substance under typical conditions.
For a pure substance, Diagram (a) reflects more likely conditions where the typical phase boundaries can be observed realistically. Diagram (b) presents an improbable scenario with peculiar phase boundary modifications that do not generally occur, such as the Solid phase extending incorrectly at low to high temperatures across a range of pressures.
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