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