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Homework Help: Pressure and Mass

  1. Jan 27, 2010 #1
    1. The problem statement, all variables and given/known data
    A storage tank contains 29.5 kg of N2 at a pressure of 3.87. What will thep ressure be if the N2 is replaced with an equal mass of CO2

    2. Relevant equations

    3. The attempt at a solution

    I know co2 mass is going to be 25kg.

    Another one:

    A scub tank has a volume of 3500.0 cm cubed. For very deep dives, the tank is filled with 50%(by volume) pure oxygen and 50% helium.
    A)how many molecules are in the tnak of each type of molecule if it is filled at 20.0 C to a guage pressure of 11 atm.
    B) how does the average kinetic engergy of the oxygen molecules compare to the average kinetic energy of the helium?
    C) calculate the rms speeds for eacdh type of molecule

    I used PV=NkT
    set (.0035m)(101000Pa)(11)=N(1.38x10^-23)(293K)

    and found N=9.6x10^23
  2. jcsd
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