The phase diagram for CO₂ has a triple point at -56.6 ^$\circ$C and 5.19 atm,and a critical point at 31.0 ^$\circ$C and 73 atm.The solid and gas phases are in equilibrium at -78.7 ^$\circ$C and 1.00 atm.Which of the following statements regarding CO₂ is/are CORRECT?
1) Sublimation occurs if the temperature of the solid phase is increased from -79.0 ^$\circ$C to 0.0 ^$\circ$C at a constant pressure of 2.5 atm.
2) CO₂ is a supercritical fluid at 55 ^$\circ$C and 75 atm.
3) At pressures greater than its critical pressure (73 atm) ,CO₂ will not exist as a solid at any temperature.

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The Answer of The phase diagram for CO₂ has a triple point at -56.6 $\circ$ C and 5.19 atm,and a critical point at 31.0 $\circ$ C and 73 atm.The solid and gas phases are in equilibrium at -78.7 $\circ$ C and 1.00 atm.Which of the following statements regarding CO₂ is/are CORRECT? 1)Sublimation occurs if the temperature of the solid phase is increased from -79.0 $\circ$ C to 0.0 $\circ$ C at a constant pressure of 2.5 atm. 2)CO₂ is a supercritical fluid at 55 $\circ$ C and 75 atm. 3)At pressures greater than its critical pressure (73 atm),CO₂ will not exist as a solid at any temperature.

The Phase Diagram for CO2 Has a Triple Point at -56.6

The Phase Diagram for CO₂ Has a Triple Point at -56.6