The phase diagram for CO₂ is given below.The triple point is at 5.1 atm and 217 K. What happens if CO₂(l)at 30 atm and 450 K is released into a room at 1 atm and 298 K?

Question

Quizplus · Accepted Answer

According to the phase diagram, at 30 atm and 450 K, CO₂ is in the liquid phase, above the critical point and far away from the triple point. Therefore, when it is released into a room at 1 atm and 298 K, the pressure and temperature drop significantly, and the substance is no longer in its stable liquid phase. In order to reach equilibrium, the substance must vaporize until the vapor pressure reaches 1 atm, which is the atmospheric pressure in the room. Therefore, the best choice is A, the liquid vaporizes.

The Phase Diagram for CO2 Is Given Below

The Phase Diagram for CO₂ Is Given Below