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Homework Help: Molarity and molality

  1. Oct 5, 2008 #1
    1. The problem statement, all variables and given/known data
    A solution containing equal masses of glycerol, C3H8O3, and water has a density of
    1.10 g/mL. Calculate the (a) molarity; (b) mole fraction of glycerol; (c) molality of
    the solution.

    2. Relevant equations
    M=moles of solute/liters of solution
    mole fraction = n1/n(total)
    molality = mole of solute/kg of solvent

    3. The attempt at a solution
    How do you calculate the moles? i think i got the liters of solution by doing this: molar mass of gycerol/density. then convert the mL to L.
  2. jcsd
  3. Oct 5, 2008 #2


    User Avatar

    Staff: Mentor

    You are told "equal masses". That means every substance mass is a third of the solution mass. Start with 1 liter.
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