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Homework Help: Help with rms speed of gas when molecules are doubled

  1. Feb 2, 2014 #1
    1. The problem statement, all variables and given/known data
    An ideal gas is kept in a container of constant volume. The pressure of the gas is also kept constant. The number of molecules in the gas is doubled. If the initial rms speed is 1300m/s, what is the final rms speed?

    2. Relevant equations

    3. The attempt at a solution
    I've tried to rework the above equations hoping I would find something but there seem to be too many unknowns. I know that you need to lower the temperature of the gas, but I'm not given the initial temp or the final, and I don't know the initial number of molecules. Thanks
  2. jcsd
  3. Feb 2, 2014 #2

    Andrew Mason

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    Science Advisor
    Homework Helper

    Express the initial T in terms of the other variables. If PV is kept constant and N is doubled, what happens to T?

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