Question

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

(i) In which state will \[\ce{CO2}\] exist between the points a and b at temperature T₁?

(ii) At what point will \[\ce{CO2}\] start liquefying when temperature is T₁?

(iii) At what point will \[\ce{CO2}\] 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 \[\ce{CO2}\] at equilibrium?

Answer 1

(i) At T₁ (between points ‘a’ and ‘b’) \[\ce{CO2}\] exists in gaseous state.

(ii) At point b, \[\ce{CO2}\] starts liquefying at T₁

(iii) At temperature T₂, at point ‘g’ \[\ce{CO2}\] will be completely liquefied.

(iv) No condensation at T₃ since T₃ > T_c.

(v) At T₁ liquid and gaseous \[\ce{CO2}\] are at equilibrium between b and c.