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Answer the following questions based on the p-T phase diagram CO2.

(a) CO2 at I am pressure and temperature -60°C is Compressed isothermally. Does in go through a liquid phase?

(b) What happens when CO2 at 4 atm pressure is Cooled form room temperature at Constant pressure?

(c) Describe qualitatively the Changes in a given mass of Solid CO2 at 10 atm. pressure and temperature  -60°C as it is heated up at room temperature at Constant pressure.

(d) CO2 is heated to a temperature 70°C and Compressed isothermally. What Changes in its Properties do you expect to Observe?

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(a) Since -60° lies to the left of -56.6 °C On the Curve; the Vapour Will Condense directly into the Solid.

(b) Since 4 atm pressure is less than 5.11 atm . the vapour Will condense directly into Solid Without entering into the liquid region.

(c) When the Solid CO2 at -60°C is heated at 10 atm pressure, It is first converted into a liquid, A further increase in its temperature brings it into vapour Phase. If a horizontal line at p = 10 atm  is drawn parallel to the T- axis, then the Points of intersection of this line With the fusion and vaporization curve give the fusoin and boiling Points at 10 atm.

(d) Above 31.1°C the gas Cannot be liquefied. Therefore, on being Compressed isothermally at 70°C, there Will be on transition to the liquid region. However the gas Will depart more and more form its perfect gas behavior  With the increase in pressure.

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