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Homework Help: Find mass from mole frac and solution mass

  1. Feb 1, 2007 #1
    1. 75g sample of a gaseous mixture contains .51 mole fraction propane. The remainder is butane. What are the masses of propane and butane?

    2. X = mol A / mol total

    3. The attempt at a solution
    P = mol propane
    B = mol butane
    I tried doing .49P + .49B = X mol propane and .51P + .51B = Y mol butane however that doesn't seem to be solvable. I'm not quite sure how I should manipulate the 75 g of solution.
  2. jcsd
  3. Feb 1, 2007 #2


    User Avatar

    Staff: Mentor

    0.49B + 0.51P = n

    second equation must contain masses of both gases - what is a mass of 0.49B?
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