Question

What happens when CO2 at 4 ATM pressure is cooled to room temperature at constant pressure?

Answer 1

It condenses to solid directly

Explanation:

C0₂ at 4 ATM pressure is cooled to room temperature is in vapour phase. This point (4atm) lies below the vaporation curve and to the right of the triple point. Therefore when C0₂ cooled at room temperate at constant pressure the point moves  to the solid phase region then the C0₂ condenses directly to solid form as also represent in the attached figure.