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Homework Help: Mixture of Gases

  1. Nov 27, 2007 #1
    1. The problem statement, all variables and given/known data

    A gas bottle contains a mixture of Helium and Oxygen molecules (O2 is diatomic). The root-mean-square velocity for the O2 molecules is 482 m/s. Find vrms for the Helium atoms.

    2. Relevant equations


    and solve for velocity of He, however, i am not sure what numbers to plug in for the mass.

    3. The attempt at a solution

    I filled everything in but the masses, I know that oxygen is diatomic, or O2, but what does that mean I put in for the mass? Do I need to use the mass numbers by looking at a periodic table?
  2. jcsd
  3. Nov 27, 2007 #2


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