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CO2 has Tc = 38.98 °C and Pc = 73 atm. How many phases of CO2 coexist at i. 50 °C and 73 atm ii. 20 °C and 50 atm.

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CO2 has Tc = 38.98 °C and Pc = 73 atm. How many phases of CO2 coexist at
i. 50 °C and 73 atm
ii. 20 °C and 50 atm.

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i. 50 °C and 73 atm represent a condition for CO2 above its Tc. Therefore, under this condition CO2 exists only as single phase.
ii. 20° C and 50 atm represent a condition for CO2 below its Tc. Therefore, under this condition two phases of CO2, namely, liquid and gas can coexist.

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