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A 1L flask is filled with 1.25 g of argon at 25 degrees celcium. A sample of ethane vapor is added to the same flask until the total pressure is 1.45 atm.

What is the partial pressure of argon in the flask?
Chemistry - DrBob222, Tuesday, October 5, 2010 at 9:00pm
mols Ar = 1.25/39.95 = 0.0313
Use PV = nRT to calculate pressure Ar.
Remember that the partial pressure of a gas doesn't depend upon what other gas is present. In effect, we ignore the ethane vapor although the partial pressure of the ethane COULD be calculated, also.
How to calculate partial pressure of the ethane.

  • chem -

    Ptotal = 1.45 = pAr + pethane
    You know Ptotal and pAr, calculate p ethane.

  • chem -

    .20

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