Chapter 17, Problem 47PCE

Phase Diagram for CO₂ The phase diagram for CO₂ is shown in Figure 17-38. (a) What is the phase of CO₂ at T = 20 °C and P = 500 kPa? (b) What is the phase of CO₂ at T = −80 °C and P = 120 kPa? (c) For reasons of economy and convenience, bulk CO₂ is often transported in liquid form in pressurized tanks. Using the phase diagram, determine the minimum pressure required to keep CO₂ in the liquid phase at 20 °C.