1M, The phase diagram for CO_2 has a triple point at -56.6 degree C and 5.19 atm

Question

1M, The phase diagram for CO_2 has a triple point at -56.6 degree C and 5.19 atm a critical point at 31.0 degree C and 73 atm. The solid and gas phases are in equilibrium at a temperature and pressure of -78.7 degree C and 1.00 atm. Which of the following statements regarding CO_2 is/are CORRECT? I Sublimation occurs if the temperature of the solid phase is increased from -79.0 degree C to 0.0 degree C at a constant pressure of 2.5 atm. II. CO_2 is a supercritical fluid at 55 degree C and 75 atm. III. At pressures greater than its critical pressure (73 atm), CO_2 will not exist as a solid at any temperature. Choose the best answer a through e a. I only b. II only c. III only d. I and II e. all three statements

Explanation / Answer

Triple point : -56.6 and 5.19 atm

I) sublimation occur if temperature of solid phase is increased from -79 to 0 C at constant pressure 2.5 atm

Yes at low pressure and temperature even the solid CO2 (dry ice) gets converted to CO2 gas

So its True

II) The CO2 is supercritical fluid above 72.79 atm pressure and 30.98 C temprature [ the critical point of CO2]

So yes at 55 C and 75 atm it will be supercritical fluid

III) Yes, critical point is when the substance will not exist as solid at any temperature

So all three statements are correct.

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