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Raoult's law - Example problems

This video explains some example problems on Raoult's law. 1) 100g of liquid A (molar mass 140 g mol-1) was dissolved in 1000 g of liquid B (molar mass 180gmol-1). The vapor pressure of pure liquid B was found to be 500 torr. Calculate the vapour pressure of pure liquid A, and its vapour pressure in the solution if the total vapour pressure of the solution is 475 torr. 2) The vapour pressure of pure liquids A and B are 350mm of Hg and 600mm of Hg respectively at 300K. Find out the composition of the liquid mixture if total vapour pressure is 500mm of Hg. Also find the composition in Vapour phase? 3) A mixture of ethyl alcohol and propyl alcohol has a vapour pressure of 290 mm at 250 K. the vapour pressure of propyl alcohol is 200mm. if the mole fraction of ethyl alcohol is 0.55, what is it vapour pressure at same temperature? 4) For a binary liquid solution of A and B, the mole fraction of A in liquid and vapour phases are 0.60 and 0.35 at 400 torr. What are the vapour pressure of pure liquid A and B? 5) Mixture of volatile components A and B has total vapour pressure P = 254-119xB(mole fraction of B). Find PoA and PoB.