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Rms speed of gas

  1. Dec 9, 2016 #1
    1. The problem statement, all variables and given/known data

    (introduction course of university physics)

    A 5.0- liter gas tank holds 1.7 moles of monatomic helium (He) and 1.10 mole of diatomic oxygen

    (O2), at a temperature of 260 K. The ATOMIC masses of helium and oxygen are 4.0 g/mol and

    16.0 g/mol, respectively. What is the ratio of the root- mean- square (thermal) speed of helium to

    that of oxygen?

    Answer: C

    2. Relevant equations
    V(rms) = sqrt(3kT/m)

    3. The attempt at a solution
    This is the only equation I found from my book about rms speed of gas, but the variables seems unrelated at all. I have no idea on how to do it.

    Please tell me how to deal with it in a more detail way.
    Thank you very much.
  2. jcsd
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