try it - solution

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3.6 g of H₂0 and 9.2 g of ethanol are mixed together. The soln. obeys raoultâ€™s law. Calculate the mole fraction of ethanol and water in vapour phase. P⁰_water =400 mm Hg , P⁰_ethanol=450 mm Hg

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Â°áƒ¦â€¢à¹“ÑÏ…Î ·2009-07-10 23:50:34

use raoult's law

increse in vapour pressure is directly proportional to moel fraction of solute in solution

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aieeee ·2009-07-11 00:09:21

use formula, 1/p = x'_A/P^o_A + x'_B/P^o_B
(DERIRVED USING DALTON'S LAW OF PARTIAL PRESSURES AND ROULT'S LAW).
use this formula only when solution is in vapour state.

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