question_answer 78)

  Isotherms of carbon dioxide at various temperatures are represented in figure given ahead. Answer the following questions based on this figure. (i) In which state will \[C{{O}_{2}}\] exist between the points a and bat temperature\[{{T}_{1}}\]? (ii) At what point will \[C{{O}_{2}}\]start liquefying when temperature is \[{{T}_{1}}\]? (iii) At what point will \[C{{O}_{2}}\] be completely liquefied when temperature is\[{{T}_{2}}\]? (iv) Will condensation take place when the temperature is\[{{T}_{3}}\]? (v) What portion of the isotherm at represent liquid and gaseous \[C{{O}_{2}}\] at equilibrium?

Answer:

  (i) \[C{{O}_{2}}\] will exist in gaseous state between the points 'a' and ?b? (ii) At temperature \[{{T}_{1}},C{{O}_{2}}\] will start liquefaction at point ?b? (iii) At temperature \[{{T}_{2}},C{{O}_{2}}\] will start liquefaction at \['f'\] and will completely liquefy at ?g?. (iv) No, because a gas cannot be liquefied above the critical temperature. \[({{T}_{3}}>{{T}_{c}})\] (v) At temperature\[{{T}_{2}}\], liquid and gas will exist in equilibrium between the points 'b? and ?c?