Calculating Mass of Helium Gas at STP

  • Thread starter Thread starter kasse
  • Start date Start date
  • Tags Tags
    Gas Mass
kasse
Messages
383
Reaction score
1
[SOLVED] Mass of gas

Homework Statement



What mass of He gas occupies 8.5 L at 273 K and 1 atm?

Homework Equations



PV = nRT

The Attempt at a Solution



n = PV/RT = (101 kPa * 8.5 L)/(8.3145 * 273 K) = 2.64E-3 mol --> 10.6 g

My solutions manual says 1.52 g. Am I right or wrong?
 
Physics news on Phys.org
2.64E-3 mole? Really? I seem to remember a mole of gas at STP is 22.4 liters. What does a mole of helium mass? The book is right.
 

Thread 'Initial conditions for orbits around a wormhole'

Hi, I had an exam and I completely messed up a problem. Especially one part which was necessary for the rest of the problem. Basically, I have a wormhole metric: $$(ds)^2 = -(dt)^2 + (dr)^2 + (r^2 + b^2)( (d\theta)^2 + sin^2 \theta (d\phi)^2 )$$ Where ##b=1## with an orbit only in the equatorial plane. We also know from the question that the orbit must satisfy this relationship: $$\varepsilon = \frac{1}{2} (\frac{dr}{d\tau})^2 + V_{eff}(r)$$ Ultimately, I was tasked to find the initial...
View full post »

Thread 'Help to convert units of a simple formula'

The value of H equals ## 10^{3}## in natural units, According to : https://en.wikipedia.org/wiki/Natural_units, ## t \sim 10^{-21} sec = 10^{21} Hz ##, and since ## \text{GeV} \sim 10^{24} \text{Hz } ##, ## GeV \sim 10^{24} \times 10^{-21} = 10^3 ## in natural units. So is this conversion correct? Also in the above formula, can I convert H to that natural units , since it’s a constant, while keeping k in Hz ?
View full post »

Similar threads

Root Mean Square Speed Units Question
Replies
3
Views
11K
Engineering Calculating the mass of air in a pressurised air tank
Replies
14
Views
3K
Calculating Moles and Molecules of Oxygen in a Gas Cylinder
Replies
10
Views
3K
Calculating Hydrogen Mass from Ideal Gas Law
Replies
3
Views
4K
How to find the Density of Air with PV=nRT?
Replies
7
Views
3K
Ideal Gas Law and Pressure at 80°C
Replies
2
Views
3K
Chemistry Calculating Kp of o2 and o3 equilibrium
Replies
3
Views
4K
Predicting Remaining Pressure in Compressed Gas Cylinder
Replies
3
Views
3K
Thermodynamics -- piston-cylinder device with helium is compressed....
Replies
1
Views
3K
Pressure caused by explosion in closed container
Replies
5
Views
2K

Hot Threads

Recent Insights

Back
Top