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Gen Chem, Factors Affecting Solubility

  1. May 3, 2009 #1
    1. The problem statement, all variables and given/known data

    Calculate the mass of nitrogen dissolved at room temperature in an 80.0L home aquarium. Assume a total pressure of 1.0 atm and a mole fraction for nitrogen of .78.

    2. Relevant equations

    Mole fraction= moles solute/moles solution

    Sgas=KH x Pgas

    KH = 6.1 x 10-4 M/atm

    3. The attempt at a solution

    Sgas = (6.1 x 10-4)(1 atm)
    Sgas = 6.1 x 10-4
    6.1 x 10-4/ 1 L x 80.0 L = 4.88 x 10-2 moles
    (4.88 x 10-2 moles) x 28.02 g Ns/ 1 mol = 1.37 g N2

    the correct answer is 1.1 g N2
    Where did I go wrong and where does the mole fraction bit come into play? Thanks!
    1. The problem statement, all variables and given/known data



    2. Relevant equations



    3. The attempt at a solution
     
  2. jcsd
  3. May 4, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    Partial pressure.
     
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