Molecular mass of He+MON and He+MMH

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To calculate the molecular mass of gas mixtures involving Helium (He), monomethylhydrazine (MMH), and dinitrogen tetroxide (MON), the weighted average method is recommended. The molecular masses are 4 g/mol for He, 46 g/mol for MMH, and 92 g/mol for MON. The average molecular mass is essential for accurate computations, particularly when determining properties that scale with molar mass. For the specific problem of mixing 0.5 L of He and 0.5 L of Argon (Ar), the density of the mixture can be calculated using the ideal gas law, factoring in the individual contributions of each gas based on their respective molar masses and the total volume. This approach ensures accurate results for density, which is crucial in various applications involving gas mixtures.
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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
 
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For some applications you can use weighted average - but calculation requires knowing composition of the mixtures.
 
But why to take the average and why not the sum of all three?
 
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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