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Ideal Gas Law (mass)

  1. Dec 5, 2011 #1
    1. The problem statement, all variables and given/known data

    A fixed mass of oxygen (O2, molecular mass = 32 g/mol) is contained in a cylinder whose volume is 2.80 liters. The pressure is 148 atm when the temperature is 23oC. Find the mass of oxygen in the cylinder.

    a. 20 g
    b. 80 g
    c. 140 g
    d. 280 g
    e. 546 g

    2. Relevant equations

    PV=nRT
    m=n*molar mass

    3. The attempt at a solution

    148atm*2.80L=n*8.314*296.15
    n=0.17 moles

    m=n*molar mass
    m=0.17*32
    m=5.5g

    and that is not a possible answer :s
     
  2. jcsd
  3. Dec 5, 2011 #2
    Units again!!!!!
     
  4. Dec 5, 2011 #3
    hehe thanks :s
    is the pressure supposed to be in Pa then??
     
  5. Dec 5, 2011 #4
    Has to be!!!!!!
     
  6. Dec 5, 2011 #5
    It's good to remeber that nearly everythig in thermodynamics has to be in energies which are in joules which are N*m
     
  7. Dec 5, 2011 #6
    thank you!! :)
     
  8. Dec 5, 2011 #7
    is the only wrong unit the pressure one??
    because now i am getting 558g
     
  9. Dec 5, 2011 #8
    you should have volume in m^3
     
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