How does one calculate the mass of one liter of a gas at STP?
5 replies, posted
I'm currently doing a lab and I'm measuring H2 gas. I already have a previously attained molar volume of hydrogen gas, and the mass of 2.02. How would I start off the equation?
Well unless you're in your 3 or fourth year of Uni, or further (in which case I'd hope you wouldn't be asking this here)... You use the formula PV=nRT.
P= pressure
V= volume
n= number of moles = mass of gas divided by molar mass/formula mass/whatever you may call it of gas
R= ideal gas constant
T= temperature
So at STP, you have the values for pressure and temperature (duh), R is a constant, you measured the volume soo....
[u](P*V*Formula mass)[/u] = mass of gas
R*T
I think you use the ideal gas law.
pV = nRT
EDIT:
:ninja:
[QUOTE=Killerelf12;26132041]Well unless you're in your 3 or fourth year of Uni, or further (in which case I'd hope you wouldn't be asking this here)... You use the formula PV=nRT.
P= pressure
V= volume
n= number of moles = mass of gas divided by molar mass/formula mass/whatever you may call it of gas
R= ideal gas constant
T= temperature
So at STP, you have the values for pressure and temperature (duh), R is a constant, you measured the volume soo....
[u](P*V*Formula mass)[/u] = mass of gas
R*T[/QUOTE]
Thank ya sir
Edit: Eh wait is the molar volume of hydrogen the formula mass?
Uh I believe that'd be the volume you measured no?
[QUOTE=RaveRaze;26132152]Thank ya sir
Edit: Eh wait is the molar volume of hydrogen the formula mass?[/QUOTE]
the molar volume of hydrogen is the volume of one mole of hydrogen
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