Finding Vrms given pressure, density and Temperature

Click For Summary

Homework Help Overview

The problem involves calculating the root mean square speed (Vrms) of gas molecules given the temperature, pressure, and density of the gas. The context is rooted in thermodynamics and the behavior of ideal gases.

Discussion Character

  • Exploratory, Conceptual clarification, Assumption checking

Approaches and Questions Raised

  • Participants discuss the relationship between density and molar mass, with one attempting to connect these to the calculation of Vrms. Questions arise about how to derive volume from the ideal gas law and whether the volume affects the calculation of Vrms.

Discussion Status

Some participants provide hints and guidance regarding the ideal gas law and its application, while others express confusion about the relationship between volume and the calculation of Vrms. Multiple interpretations of the problem are being explored without a clear consensus.

Contextual Notes

There is an assumption that the gas behaves ideally, and participants are navigating the implications of this assumption in their reasoning.

sckeen1988
Messages
15
Reaction score
0

Homework Statement


At 273K and .01 atm, the density of a gas is 1.24*10^-5 g/cm^3. Find the Vrms for the gas molecules.


Homework Equations



Vrms=sqrt(3RT/M) Density=m/V

The Attempt at a Solution



I tried to relate the density given to the molar mass or the number of moles somehow, but failed completely.
 
Physics news on Phys.org
Use the ideal gas law (assuming it is an ideal gas).
 
How can I get volume from that?
 
Hint: does the answer really depend on the volume? E.g., if you find the solution for 1 cubic meter of this gas, will you find a different solution for, say, 2 cubic meters, if all of the other given properties are the same?
 
Thanks a lot for your help.
 
pls enlighten me on how you re-solve this. I don't understand on ohw do you use ideal gas law to resolve this.
 

Similar threads

  • · Replies 2 ·
Replies
2
Views
4K
  • · Replies 7 ·
Replies
7
Views
3K
  • · Replies 6 ·
Replies
6
Views
799
  • · Replies 9 ·
Replies
9
Views
1K
  • · Replies 5 ·
Replies
5
Views
11K
  • · Replies 2 ·
Replies
2
Views
2K
  • · Replies 6 ·
Replies
6
Views
7K
Replies
19
Views
2K
  • · Replies 2 ·
Replies
2
Views
3K
Replies
3
Views
2K