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A solution M is prepared by mixing ethanol and water. The mole fraction of ethanol in the mixture is 0.9. Given k_(f)("water")=1.86Kkg"mol"^(-1) k_(f)("ethanol")=2.0Kkg"mol"^(-1) k_(b)("water")=0.52Kkg"mol"^(-1) k_(b)("ethanol")=1.2Kkg"mol"^(-1) Standard f.p. of water = 273 K Standard f.p. of ethanol = 155.7 K Standard b.p. of water = 373 K Standard b.p. of ethanol = 351.5 K Vapour pressure of pure water = 32.8 mmHg Vapour pressure of pure ethanol = 40 mmHg Molecular weight of water = 18 g "mol"^(-1) Molecular weight of ethanol = 46 g "mol"^(-1) consider the solutions to be ideal dilute solutions and solutes to be nonvolatile and non-dissociative. The vapour pressure of the solution M is |
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Answer» 39.3 mmHg |
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