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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%

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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