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

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?

Quizplus · Accepted Answer

According to the phase diagram, at 30 atm and 450 K, CO₂ is in the vapor phase. When it is released into a room at 1 atm and 298 K, the pressure decreases and the temperature decreases as well. Therefore, the CO₂ will condense and become a liquid. Since the initial conditions were above the vapor pressure curve, the liquid will be above its boiling point at 298 K and will vaporize to reach equilibrium with the surrounding air. Therefore, the correct choice is A, the liquid vaporizes.

The Phase Diagram for CO2 Is Given Below

The Phase Diagram for CO₂ Is Given Below