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!

Homework Help: Translational Energy

  1. Dec 19, 2009 #1
    1. The problem statement, all variables and given/known data
    1.2 x10^23 molecules of a monatomic ideal gas occupies the volume of 0.63 m3 at
    atmospheric pressure. Find the average translational kinetic energy of one molecule.


    2. Relevant equations

    PV = NRT

    K = 3/2*kB*T

    3. The attempt at a solution

    T = PV/NR

    But.. whats N(moles)?
     
  2. jcsd
  3. Dec 19, 2009 #2

    ideasrule

    User Avatar
    Homework Helper

    One mole of anything = 6.03*10^23 molecules of that thing. BTW, you can also use PV=nkT. That way, you can directly plug in 1.2 x10^23 into "n".
     
  4. Dec 19, 2009 #3
    In this equation usually moles: here 1.2/6.02= n. The 10^23 on top and bottom cancel.
     
  5. Dec 19, 2009 #4
    Ok so I get T = 39425 K :S
     
  6. Dec 19, 2009 #5

    ideasrule

    User Avatar
    Homework Helper

    That's correct, although not realistic. 1.2*10^23 of a room-temperature gas would take up around 5 L.
     
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook