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: Gas Molecule

  1. May 19, 2005 #1
    hi all

    if you have a cylinder with helium and argon in it, and the mixture is at equilibrium, with a temperature of 150 degrees celsius. what is the average kinetic energy of each gas molecule?, and what is the rms speed of each type of molecule?

    im aware of the theory behind this, but it seems that i just cannot obtain the answer.
    im using the formula
    1/2mv^2 (kinetic energy) = 3/2kT
    i think im going wrong with calculating k, isnt that a constant, 1.38 X 10 ^ -23.

    thanx for any help
  2. jcsd
  3. May 19, 2005 #2
    Yes that k is the Boltzmann constant, with that value. Perhaps you are forgetting to convert to kelvin?
  4. May 19, 2005 #3
    hmm, yes, i did forget to convert to kelvin, i thought i did, oh well, thanx for the notice!
Share this great discussion with others via Reddit, Google+, Twitter, or Facebook