Help with Diffusion Rateee~

[ipodtouch]

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Hey guys, I need a little bit of help on understanding diffusion rates.

I know that diffusion rate increases with:
1.) increased velocity of the molecules
2.) increased concentration difference between the two areas
3.) decreased total concentration/ Increase in volume (increased mean free path).


I was wondering what happened as diffusion begins to progress.
--> Does the diffusion rate increase? Because there is less concentration, and hence a greatly increased mean free path.

--> Or does the diffusion rate decrease? Because there is decreased concentration difference.


Also, just wanted to confirm that concentration difference has no effect on Effusion?

 

[chiddler]

it depends on the reaction and whether it is endo/exothermic and how the molar mass of the product gases are in relation to reactants.

 

[ipodtouch]

Whoop, I didn't mean to say "reaction"

It's just a regular diffusion with noble gases.

 

[ipodtouch]

What happens to the rate of diffusion from Time=2 to Time=10?
And why?

 

[chiddler]

hm..

intuition says it'll decrease because less gas remains over time. i don't have an equation to back it up though. do you happen to have the answer?