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Worked gas prob with my anwer +correct answer

  1. Apr 4, 2009 #1
    stoichiometric relationships

    1. The problem statement, all variables and given/known data

    hey guys just wondering if ya could tell me where i went wrong
    "One process related to formation of smog is:
    2NO(g) + O2(g) 2NO2(g)
    This reaction can be monitored in the laboratory by finding the total pressure of a mixture of the gases.

    A bulb of volume 1.000 L is filled with a mixture of NO(g) and O2(g). The initial total pressure is 335 kPa at 26.4°C. After 6 hours the total pressure is 263 kPa. What mass of NO2(g) in grams has been formed? "

    PV=nRT
    P=335Kpa-263Kpa=72Kpa
    R=8.314
    v=1
    t=299.4K

    n=PV/RT=72/(8.314*299.4)=0.0289
    Therefore mass =moles*molermass=0.0289*46.01=1.33grams HOWEVER answer is 2.66grams? therefore i should mulitple my answer by 2, but Y?
    anyhelp would be apprecitated




    2. Relevant equations



    3. The attempt at a solution
     
    Last edited: Apr 4, 2009
  2. jcsd
  3. Apr 4, 2009 #2

    Borek

    User Avatar

    Staff: Mentor

    If I understand what you did correctly, 72 kPa is amount of oxygen that reacted - take a look at the reaction equation now...
     
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