Multiple Choice
When water vapor is cooled at constant pressure, which phase change is most likely to occur?
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13. Liquids, Solids & Intermolecular Forces
Phase Diagrams
Multiple Choice
Consider the phase diagram for carbon dioxide. At 1 atm pressure and room temperature (25 ^\(\circ\) C), what is the physical state of CO_2?
A
Gas
B
Supercritical fluid
C
Liquid
D
Solid
Verified step by step guidance1
Identify the given conditions: pressure = 1 atm and temperature = 25 ^\(\circ\) C (room temperature).
Recall that the phase diagram of CO_2 shows the regions where CO_2 exists as a solid, liquid, gas, or supercritical fluid depending on pressure and temperature.
Note the critical point of CO_2 is approximately 73 atm and 31 ^\(\circ\) C; below this pressure and above the sublimation temperature, CO_2 cannot exist as a liquid at 1 atm.
At 1 atm and 25 ^\(\circ\) C, check the phase diagram to see which phase region these conditions fall into; since 1 atm is below the triple point pressure (~5.1 atm), CO_2 sublimates directly from solid to gas.
Conclude that under these conditions, CO_2 is in the gaseous state.
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