Molecular mass of He+MON and He+MMH

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SUMMARY

The molecular mass calculations for gas mixtures involving Helium (He), Monomethylhydrazine (MMH), and Dinitrogentetraoxide (MON) are essential for accurate computations in various applications. The molecular masses are as follows: He = 4 g/mol, MMH = 46 g/mol, and MON = 92 g/mol. For mixtures of He+MMH, He+MON, and He+MMH+MON, the weighted average method is recommended for accurate results, as some properties scale with the average molar mass rather than the sum. Understanding the composition of the mixtures is crucial for these calculations.

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  • Understanding of molecular mass and its significance in gas mixtures
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  • Basic knowledge of gas laws and behavior at varying temperatures
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hamzaaaa
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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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