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March 27, 2017

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An aqueous solution of ethanol is 14.1M C2H5OH. The density of the solution is 0.853g/mL. What is molality of ethanol in the solution? What is mass % of ethanol in solution?

I got the molality which is -21.7 ethanol, but I can't figure out how to get the mass % from the molality?

  • Chemistry - ,

    molality = mols EtOH/kg solvent
    Convert mols EtOH to grams. g = mols x molar mass.
    Add g EtOH to 1000 for mass solution.
    Then mass % = (grams EtOH/total grams)*100 = ?
    By the way, I wonder how you obtained -21.7m. A negative number for concentration? I don't think so.

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