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Calculate mole fraction of ethanol and w...

Calculate mole fraction of ethanol and water in a sample of rectified spirit which contains 92% ethanol by mass.

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Mass of rectified spirit (ethanol + water) = 100 g
`:.` Mass of ethanol `=100- 92 = 8g`
`n_("ethanol") =92/4"mol" = 2 mol.`
`n_("water")=8/18"mol"=2 mol`
`x_("ethanol")=(n_("ethanol"))/(n_("ethenol")+n_("water"))=2/(2+0.44)=0.82`
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