Multiple Choice
Based on the phase diagram of substance X, which point represents the triple point where solid, liquid, and gas phases coexist in equilibrium?
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13. Liquids, Solids & Intermolecular Forces
Phase Diagrams
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The critical point of this substance occurs at what temperature?
A
0 °C
B
–78.5 °C
C
–56.7 °C
D
31 °C
E
100 °C
Verified step by step guidance1
Identify the critical point on the phase diagram. The critical point is where the liquid and gas phases become indistinguishable.
Observe the phase diagram provided. The critical point is typically located at the end of the liquid-gas boundary line.
In the diagram, locate the point where the liquid-gas boundary line ends. This is marked at 31 °C.
Understand that at the critical point, the substance cannot exist as a liquid or gas separately, and this is characterized by a specific temperature and pressure.
Conclude that the critical temperature for this substance, as indicated on the phase diagram, is 31 °C.
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