Molecular mass of He+MON and He+MMH

  1. Mar 16, 2013 #1
    Dear all

    I have a case. I have two tanks, one is filled with Helium gas and monomethylhydrazine(MMH) and another tank with Helium gas and Dinitrogentetraoxide(MON). Both tanks are at 47degC so they are in gaseous form.

    I want to know what will be the Molecular Mass of the gas. The molecular mass of He=4 g/mol,MMH=46 g/mol and MON=92 g/mol.

    So can anyone tell me what will be the molecular mass i should use for computations for (He+MMH, He+MON and He+MMH+MON)

    Thanks
     
  2. jcsd
  3. Mar 16, 2013 #2

    Borek

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    Staff: Mentor

    For some applications you can use weighted average - but calculation requires knowing composition of the mixtures.
     
  4. Mar 18, 2013 #3
    But why to take the average and why not the sum of all three?
     
  5. Mar 18, 2013 #4

    Borek

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    Staff: Mentor

    Because some properties scale as the average of the molar mass.

    Solve this problem: you mix 0.5 L He and 0.5 L Ar. What is the density of the mixture?
     
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