Question

Answer this based on the the P-T phase diagram of CO₂: Is CO₂ solid, liquid or gas at (a) - 70° C under 1 atm (b) -60° C under 10 atm (c) 15° C under 56 atm.

Answer 1

Please refer the attachment to the P_T phase diagram of Co2 :

(a) - 70° C under 1 atm :

The CO2 will be in Vapour phase.

b) -60° C under 10 atm  :

The co2 will be in solid phase.

C)  15° C under 56 atm.

The co2 will be in liquid phase.