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Q.

The triple point of CO2 occurs at 5.1atm and -56C. Its critical temperature is 31C. Solid CO2 is more dense than liquid CO2. Under which combination of pressure and temperature is liquid CO2 stable at equilibrium?

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a

10atm and 25C

b

5.1atm and 25C

c

5.1atm and 100C

d

10atm and 33C

answer is A.

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Detailed Solution

At pressures less than 5.11177 atm, carbon dioxide has no liquid state. At 1 atm (0.101325 MPa), the gas deposits immediately to a solid below 194.6855(30) K and the solid sublimes directly to a gas above this temperature.

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