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Homework Help: Ideal gas law

  1. Nov 19, 2014 #1
    1. The problem statement, all variables and given/known data
    A welder using a tank of volume 7.40×10−2m3 fills it with oxygen (with a molar mass of 32.0g/mol ) at a gauge pressure of 3.20×105Pa and temperature of 38.7∘C. The tank has a small leak, and in time some of the oxygen leaks out. On a day when the temperature is 22.9∘C, the gauge pressure of the oxygen in the tank is 1.60×105Pa .
    2. Relevant equations
    (a)Find the initial mass of oxygen.
    (b)Find the mass of oxygen that has leaked out.
    3. The attempt at a solution
    link to calculations
    answer I got: 0.29225 kg
    this answer was incorrect
  2. jcsd
  3. Nov 19, 2014 #2


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    Homework Helper

    Welcome to PF.
    Type in your calculation, please.
    You used the gauge pressure instead of the pressure of the gas. Do you know what gauge pressure is?
  4. Nov 19, 2014 #3
    ok I see where I did wrong
    Thanks for the help.
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