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Class 12 Tuition > Learn Intext Exercise 2.3 > The vapour pressure of pure liquids A and B are 450...
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The vapour pressure of pure liquids A and B are 450 and 700 mm Hg respectively, at 350 K. Find out the composition of the liquid mixture if total vapour pressure is 600 mm Hg. Also find the composition of the vapour phase.

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It is given that: = 450 mm of Hg = 700 mm of Hg ptotal = 600 mm of Hg From Raoult’s law, we have: Therefore, total pressure, Therefore, = 1 − 0.4 = 0.6 Now, = 450 × 0.4 = 180 mm of Hg = 700 × 0.6 = 420 mm of Hg Now, in the vapour phase: Mole fraction of liquid A = 0.30 And,...
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It is given that: = 450 mm of Hg = 700 mm of Hg ptotal = 600 mm of Hg From Raoult’s law, we have: Therefore, total pressure, Therefore, = 1 − 0.4 = 0.6 Now, = 450 × 0.4 = 180 mm of Hg = 700 × 0.6 = 420 mm of Hg Now, in the vapour phase: Mole fraction of liquid A = 0.30 And, mole fraction of liquid B = 1 − 0.30 = 0.70 read less
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