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Gen Chem, Factors Affecting Solubility

  • #1

Homework Statement



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.

Homework Equations



Mole fraction= moles solute/moles solution

Sgas=KH x Pgas

KH = 6.1 x 10-4 M/atm

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!

Homework Statement





Homework Equations





The Attempt at a Solution

 

Answers and Replies

  • #2
Borek
Mentor
28,327
2,716
Where did I go wrong and where does the mole fraction bit come into play?
Partial pressure.
 

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