Answer
Referring to Figure 11.41 in the textbook:
(a) At 4 atm and $-60^{\circ}C$, the solid phase of $CO_{2}$ will be stable.
(b) At 0.5 atm and $-20^{\circ}C$, the vapor phase of $CO_{2}$ will be stable.
Work Step by Step
Referring to Figure 11.41 in the textbook:
(a) At 4 atm and $-60^{\circ}C$, the solid phase of $CO_{2}$ will be stable.
(b) At 0.5 atm and $-20^{\circ}C$, the vapor phase of $CO_{2}$ will be stable.
