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Homework Help: What is the mass of air in a hot air balloon with these conditions?

  1. Apr 26, 2010 #1
    1. The problem statement, all variables and given/known data

    A hot air balloon has a volume of 2000m^3, and air is always at atmospheric pressure due to large opening. What is the mass of the air if the temp is 120*c. Assume a molecular weight of 28.8g/mol for the air)


    2. Relevant equations

    PV=nrt

    3. The attempt at a solution

    I don't really have one, my class notes on this section are not clear, and the instructor was gone but still expected us to learn it. I don't get it. Please help, this is due tonight at midnight my whole grade hangs in the balance.
     
  2. jcsd
  3. Apr 26, 2010 #2

    mgb_phys

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    Does PV=nRT ring any bells?
     
  4. Apr 26, 2010 #3
    come on, some help please!
     
  5. Apr 26, 2010 #4

    mgb_phys

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    http://en.wikipedia.org/wiki/Pv=nrt

     
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