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

[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.

 

[Hootenanny]

I think you'll find the RMM of Hydrogen is 1.

 

[Valhalla]

4.62g equals .00462kg NOT 4.62*10^3kg

should fix your answer

 

[QueenFisher]

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.