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16. Mole fraction of ethanol in ethanol water mixture is0.25. Hence percentage concentration of ethanolby weight of mixture is :(1) 25% (2) 75% (3) 46% (4) 54% |
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Answer» Given that the mole fraction of ethanol-water system is 0.25 i.e. solution contains 0.25 mol EtOH and 0.75 mol H2O Mol wt of EtOH is 46.06 g/mol Therefore 0.25 mol = 11.515 gof EtOH Mol wt of H2O is18.01528 g/mol There fore 0.75 mol =13.51 g ofH2O Total weight = 25.02646 gms Wt % of EtOH is 11.515 / 25.02646 x 100 =46.011 % |
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