How Do You Calculate the Density of Hydrogen Gas in a Cylinder?

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Homework Help Overview

The discussion revolves around calculating the density of hydrogen gas in a cylinder, involving the ideal gas law and molecular mass considerations.

Discussion Character

  • Exploratory, Assumption checking, Conceptual clarification

Approaches and Questions Raised

  • The original poster attempts to calculate the number of moles and density of hydrogen gas using the ideal gas law, while questioning the relative molecular mass provided. Participants raise concerns about the conversion of mass and the interpretation of molecular mass.

Discussion Status

Participants are actively engaging with the calculations, offering corrections and clarifications regarding the molecular mass of hydrogen and the conversion of grams to kilograms. There is no explicit consensus on the molecular mass, and multiple interpretations are being explored.

Contextual Notes

There is a potential misunderstanding regarding the molecular mass of hydrogen, with references to both H and H2, which may affect the calculations. The original poster expresses concern about the accuracy of their results.

QueenFisher
ideal gases. what fun. please help!

i'm having problems getting sensible answers...

1.
a cylinder contains 4.62g of hydrogen at 17C and 2.32 x10^6 Pa
calculate number of moles.

actual mass/molecular mass= 4.62/2= 2.31
(relative molecular mass given as 2 in the question...is this right??)

calculate density of gas.
density=mass/volume

volume:
using pV=nRT
V=nRT/p
=2.31x8.31x(17+273) all divided by 2.32x10^6
=0.00239951...

density=4.62x10^3 (to make it into kg) divided by 0.00239951...

gives 1925393.101... kgm^-3
which seems awfully high.
i have another question but i'll put it in another thread before my computer crashes and i lose all of this.
 
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I think you'll find the RMM of Hydrogen is 1.
 
4.62g equals .00462kg NOT 4.62*10^3kg

should fix your answer
 
Hootenanny said:
I think you'll find the RMM of Hydrogen is 1.


well then either my physics teacher is wrong, or he was thinking of it in terms of H2 molecules. i did wonder when i read it if it was right, but i ended up with the right answer.
 

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