Answer the following questions based on the phase diagram for carbon dioxide. Re

Question

Answer the following questions based on the phase diagram for carbon dioxide. Refer to Figure 4 in the reading. 2. a. Does carbon dioxide have a normal boiling point? (Yes/No) b. What is the critical temperature, in °C c. What is the critical pressure, in atm d. Pick a temperature and pressure where it would exist as a atm supercritical fluid. atm e. Pick a temperature and pressure where it would exist as a solid atm f. In what phase is CO2 at 10°C and 72 atm? g What is the temperature and pressure at the triple point? atm

Explanation / Answer

Part a

Normal boiling point of CO2 = - 78°C at 1 atm

Under normal conditions CO2 sublimes from Solid to gas phase directly.

From the phase diagram 1 atm and - 78°C lie on the solid - vapor equilibrium line.

Yes, CO2 has a normal boiling point

Part b

At point C, vertical line on X-axis give the critical temperature

Critical temperature at point C = 31.10 °C

Part C

At point C, horizontal line on Y-axis give the critical pressure

Critical pressure at point C = 72.8 atm

Part d

Supercritical fluid exists when the temperature and pressure exceeds the critical temperature and critical pressure

T > 31.10 °C

P > 72.8 atm

Supercritical fluid condition

Pressure = 80 atm

Temperature = 35 °C

Part e

Solid

Pressure = 1 atm

Temperature T = - 70°C

Part F

At 10 c and 72 atm - liquid

Part g

Triple point

Temperature = - 56.6 C

Pressure = 5.1 atm

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