1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

(19-74) Ideal gas problem

  1. Dec 9, 2011 #1
    1. The problem statement, all variables and given/known data

    An oxygen cylinder for medical use contains oxygen at a pressure of 140 atm, at room temperature (20[itex]\circ[/itex]C). The cylinder measures 20 cm in diameter and 110 cm in length. How many kilograms of oxygen does this cylinder contain? What will be the volume of the oxygen if it is allowed to expand slowly to normal atmospheric pressure, at room temperature?

    2. Relevant equations

    ideal-gas law pV=nRT

    3. The attempt at a solution

    Vcylinder= ∏r2h=(∏)(10 cm)2(110 cm)=3.45 cm3

    moxygen= 3.45 cm3 X 1.141 g[itex]\bullet[/itex]cm3=3.94 g or 0.00394 kg

    According to the book the answer to this part is 6.4 kg

    What did I do wrong?
  2. jcsd
  3. Dec 9, 2011 #2


    User Avatar
    Homework Helper

    Take care of the units, and recalculate the volume.
    How did you get the mass? Note that the density of gases depend on pressure and temperature.

Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook

Similar Discussions: (19-74) Ideal gas problem
  1. Ideal gas law problem? (Replies: 2)

  2. Ideal Gas Law Problem (Replies: 3)

  3. Ideal gas law problem (Replies: 13)

  4. Ideal gas law problem (Replies: 9)