Question

1) A and B are volatile liquids. In the figure below, the partial pressure of A and B in a liquid solution of these two substances (at T = 40.°C) is plotted against Xx, the mole fraction of A in the liquid solution. 400. P (tor) Pa 300 200 100 pa 0.0 0.2 0.4 0.8 1.0 0.6 mole fraction A a) Do A and B form an ideal liquid solution (yes/no)? [4 points) b) What is the value for paº, the vapor pressure of pure liquid B, at T - 40.0°C? [6 points)

Answer 1

(1) Calay 2 miscible are mined they lequias partial pressure of each cliquid gwen by is PA= nAX po Protal = PA+PB Poar Parkible pressure of chure solution role fraction of nas role Par Partial bressie sure of A now well take the point Ruhere MO- ou P total 100 Tour.. Now PA=MAXPO A 2" PA=0.4X280 = 112 torr PB 0.6 x 400 2.40 tour Protal = 352 torr now P Expected > Experimental So this is not an Ideal solution. (6) for pure liquid B i e nB=1 & nA=0 4oo Torr Р B = u oo torr

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