Chemistry

Question

What is the mole fraction of water in 200g of 95% (by mass) ethanol, C2H5OH?
C2H5OH= 46g/mol

1 Answer

  • For the given 200 g of 95% ethanol solution, ethanol is 190g and water is 10g. We determine the number of moles per component.
            ethanol:    (190 g ethanol) / (46 g/mole) = 4.13 moles
             water:      (10 g water)/(18 g/mole) = 0.55 moles

    Total moles of the solution is 4.68 moles

    Mole fraction of water:  = 0.55 moles/4.68 moles = 0.117
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