# Homework Help: Kinetic Theory of Gases Little help please

1. Dec 7, 2005

### Seiya

Kinetic Theory of Gases... Little help please :)

Hey, i didnt seem to have trouble with any other questions except this one.... all i could figure out is that i somehow must use the kinetic theory of gases?
A massless cylinder 34 cm long rests on a horizontal frictionless table. The cylinder is divided into two equal sections by a membrane. One section contains nitrogen and the other contains oxygen. The pressure of the nitrogen is twice that of the oxygen. How far will the cylinder move if the membrane is removed?
I tried setting 2pv= 2N(1/2mvx^2)av and divide it by pv= 2N(1/2mvx^2)
well i dont really know any advice appreciated :| :surprised

2. Dec 7, 2005

### Astronuc

Staff Emeritus
Where is the center of mass before the membrane is removed and then after?

At the same temperature and same volume, what are the relative molecular densities of N2 and O2. Think PV=nRT.

Note also the difference in molecular masses.

3. Dec 7, 2005

### Seiya

Got it, thanks

Last edited: Dec 7, 2005