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  • Isotherms of carbon dioxide at various temperatures are represented in Fig. 5.5. Answer the following questions based on this figure. (i) In which state will CO_{2} exist between the points a and b at temperature T1?

Isotherms of carbon dioxide at various temperatures are represented in Fig. 5.5. Answer the following questions based on this figure.

(i) In which state will CO_{2} exist between the points a and b at temperature T1?
(ii) At what point will CO_{2} start liquefying when temperature is T1?
(iii) At what point will CO_{2} be completely liquefied when temperature is T2.
(iv) Will condensation take place when the temperature is T3.
(v) What portion of the isotherm at T1 represent liquid and gaseous CO_{2} at equilibrium?

Answers (1)

(i) Between the points, a and b, CO_{2} will exist in a gaseous state at temperature T1.

(ii) At point b there is phase transition, and the plot becomes linear.

(iii) At Temperature T2, CO_{2}  will be completely liquefied at point g.

(iv) T3 > Tc. At T3 temperature, condensation will not take place.

(v) Liquid and gaseous CO_{2} are in equilibrium between b and c.

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