Using the phase diagram for CO2, what phase is carbon dioxide in at 20°C and 25 atm pressure?
A. It is at its boiling point.
B. It is in the gas phase.
C. It is at its melting point.
D. It is in the liquid phase.
Answer (1)
Locate the point (20°C, 25 atm) on the phase diagram.
Determine the region this point falls into.
Identify the phase corresponding to that region.
Conclude that carbon dioxide is in the liquid phase at 20°C and 25 atm pressure.
The answer is D .
Explanation
Understanding the Problem We are given a phase diagram for C O 2 and asked to determine the phase of carbon dioxide at 2 0 ∘ C and 25 atm pressure.
Locating the Point on the Diagram To solve this, we need to locate the point ( 2 0 ∘ C , 25 atm ) on the phase diagram and see which region it falls into.
Determining the Phase Looking at the phase diagram, the point at 2 0 ∘ C and 25 atm falls within the region labeled 'Liquid'.
Final Answer Therefore, carbon dioxide is in the liquid phase at 2 0 ∘ C and 25 atm pressure.
Examples
Phase diagrams are used in material science and engineering to understand the behavior of materials under different conditions. For example, knowing the phase of C O 2 under specific temperature and pressure conditions is crucial in designing carbon capture and storage systems. If we want to store C O 2 underground, we need to know the conditions under which it will remain a liquid, ensuring it stays contained and doesn't escape as a gas. This helps in mitigating climate change by safely storing greenhouse gases.
