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Calculate the molality of acetone in an aqueous solution with a mole fraction for acetone of 0.235. Answer in units of m.

  • Chemistry - ,

    acetone = Ac2O

    I would try something like this.
    Take some value of g H2O, say 18 g (you may need to use more precise numbers than I).
    moles H2O = 18/18 = 1 mole.
    Then XH2O = 0.765 = (1 mole H2O/1 mole H2O + x moles Ac2O).
    Solve for x moles Ac2O. Convert mols Ac2O to grams Ac2O remembering g = mols x molar mass.

    Now you have grams water and mole Ac2O, molality = moles/kg solvent.
    Post your work if you get stuck.

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