Molecular mass of He+MON and He+MMH

  • Thread starter Thread starter hamzaaaa
  • Start date Start date
  • Tags Tags
    Mass Molecular
Click For Summary

Discussion Overview

The discussion revolves around calculating the molecular mass of gas mixtures involving helium (He) with monomethylhydrazine (MMH) and dinitrogentetraoxide (MON). Participants explore different approaches to determining the molecular mass for these mixtures at a specified temperature.

Discussion Character

  • Technical explanation
  • Debate/contested
  • Mathematical reasoning

Main Points Raised

  • One participant states the molecular masses of the individual gases: He=4 g/mol, MMH=46 g/mol, and MON=92 g/mol.
  • Another participant suggests using a weighted average for the molecular mass, noting that this requires knowledge of the composition of the mixtures.
  • A different participant questions the rationale behind using an average instead of the sum of the molecular masses of the components.
  • In response, a participant explains that some properties scale as the average of the molar mass.
  • A participant introduces a related problem involving the mixing of helium and argon, asking for the density of the mixture, which may imply a connection to the original inquiry.

Areas of Agreement / Disagreement

Participants express differing views on whether to use a weighted average or the sum of molecular masses for the gas mixtures, indicating that the discussion remains unresolved.

Contextual Notes

The discussion does not clarify the specific compositions of the gas mixtures, which may affect the calculations. There is also no consensus on the appropriate method for determining the molecular mass.

hamzaaaa
Messages
30
Reaction score
0
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
 
Chemistry news on Phys.org
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?
 

Similar threads

Moles, Molecular mass, Number of Molecules Im lost.
  • · Replies 19 ·
Replies
19
Views
18K
Engineering Calculating the mass of air in a pressurised air tank
  • · Replies 14 ·
Replies
14
Views
3K
Chemistry Why does the solution divide by two in Mole Stoichiometry?
  • · Replies 1 ·
Replies
1
Views
3K
How Does Turbulent Mixing Affect Atmospheric Pressure with Altitude?
  • · Replies 2 ·
Replies
2
Views
4K
Mass spectrometry: does anyone know what could be this compound?
  • · Replies 2 ·
Replies
2
Views
2K
Undergrad Relationship between the pressure gradient and mass flow of a gas
  • · Replies 24 ·
Replies
24
Views
6K
Calculating RMS Speed of Helium & Oxygen Gas at 260K
  • · Replies 6 ·
Replies
6
Views
5K
Undergrad How to calculate the mass of gas in a tank?
  • · Replies 109 ·
4
Replies
109
Views
9K
Molecular Specific Heat of an Ideal Gas: Computations
  • · Replies 8 ·
Replies
8
Views
2K
What is the difference between atomic mass and molar mass in chemistry?
  • · Replies 1 ·
Replies
1
Views
4K