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Homework Help: Finding Vrms given pressure, density and Temperature

  1. Jul 5, 2009 #1
    1. The problem statement, all variables and given/known data
    At 273K and .01 atm, the density of a gas is 1.24*10^-5 g/cm^3. Find the Vrms for the gas molecules.

    2. Relevant equations

    Vrms=sqrt(3RT/M) Density=m/V

    3. The attempt at a solution

    I tried to relate the density given to the molar mass or the number of moles somehow, but failed completely.
  2. jcsd
  3. Jul 5, 2009 #2


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    Homework Helper

    Use the ideal gas law (assuming it is an ideal gas).
  4. Jul 5, 2009 #3
    How can I get volume from that?
  5. Jul 6, 2009 #4


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    Hint: does the answer really depend on the volume? E.g., if you find the solution for 1 cubic meter of this gas, will you find a different solution for, say, 2 cubic meters, if all of the other given properties are the same?
  6. Jul 6, 2009 #5
    Thanks alot for your help.
  7. Jul 13, 2009 #6
    pls enlighten me on how you re-solve this. I don't understand on ohw do you use ideal gas law to resolve this.
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