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Homework Help: Gravimetric chemistry equation balance problem

  1. Sep 2, 2017 #1
    • Thread moved from the technical forums, so no Homework Template is shown
    Q : sample 0.2795 g containing only C6H6Cl6 (Mw = 209.8) and C14H9Cl5 (Mw = 354.5)
    precipitate AgCl 0.7161 g (Calculate %(C6H6Cl6) and %(C14H9Cl5) in sample)

    AgCl has 143.3 g/mol and 4.997 x 10-3

    I get
    0.2795 g = weight of (C6H6Cl6) + weight of (C14H9Cl5)

    mol of AgCl = mol of (C6H6Cl6) + mol of (C14H9Cl5)

    where weight of (C6H6Cl6) = x

    4.997 x 10-3 = x/(Mw of C6H6Cl6) + (0.2795 - x)/(Mw of 14H9Cl5)

    I have calculated and my answer incorrectly

    (The correct answer is 26.01 % (C6H6Cl6) and 77.99% (14H9Cl5))

    please help me !!!
  2. jcsd
  3. Sep 2, 2017 #2


    User Avatar

    Staff: Mentor

    Doesn't look correct to me.
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