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7. (8 points) At the end of lecture on Thursday, 10/12, activity was introduced and defined. The figure at the right shows the vapor pressures of A and B over a condensed solution of A and B for a fixed temperature. Well be using activity a lot in solution thermodynamics. This problem is an introduction to activity (a) What is the activity of A, a, in a solution 1 10 8 10 PA 戌 with XB0.25? (b) What is the activity of B, amin a solution with XB- 0.25? (c) What is the activity of B, an®f pure B? (d) What is the activity of A, a, of pure B? 0 0.2 0.8 0.4 Mole Fraction of B 0.6

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110 8 10 610 4 10 IP 210 -Рв = 2.1*1047 a 010 U 0 0.2 0.4 = 0.25 Mole Fraction of B 0.6 08 Activity of componant A can be given b Ppartial pressure of componant A, PA partial pressure of pure componant A (Le·when there is no componant B present) a) when X0.25 (shown as above), P 8.5 10A-7 atm and P 110-6 atm a(8.5 10A 7)/ (1 10A-6) 0.85

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