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Determining the temperature of the solid phase

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The phase diagram for CO2 has a triple point at -56.6 °C and 5.19 atm, and a critical point at 31.0 °C and 73 atm. The solid and gas phases are in equilibrium at -78.7 °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 °C to 0.0 °C at a constant pressure of 2.5 atm.

2) CO2 is a supercritical fluid at 55 °C and 75 atm.

3) At pressures greater than its critical pressure (73 atm), CO2 will not exist as a solid at any temperature.

- A. 3 only

- B. 1 and 2

- C. 2 only

- D. 1, 2, and 3

- E. 1 only

Reference no: EM132508856

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