A & B form ideal solution. A graph is plotted between Total pressure(y-axis) and Mole fraction(x-axis).From the given data, vapour pressure of pure liquid ‘A’ will be
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a
450mm
b
400 mm
c
420mm
d
360mm
answer is A.
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Detailed Solution
Given total pressure is 300mm when XA=0.4. When XA=0 then XB=1; thus pB0 =200mm;Ptot = PAo0.4+2000.6300 = 0.4pA0 +1200.4PAo = 180PAo = 18004 = 450mm