[Kimyko]

Or more specifically...uhm, problems having to do with collecting gas over water and then correcting for the dry gas. Oo; Uhm, the main problem is that not only do I not know what to do, I have no practice problems to try out, and all my notes from that particular section - because it was so long ago - has gone missing. Not surprising considering the ungodly mess that is my room, but that's beside the point.

Uh, anyway...what I would really appreciate is if someone could please tell me the basic steps one would go through to solve a problem like that. And then maybe, if it's not too much trouble, point me in the direction of a website or something that has problems where I can try it out on... I checked in my book and I don't think there are any in there. I will check again, though. And nobody has to do the last part, I was just wondering, sorry...

Oh, and so I don't seem like I'm just trying to get easy answers...this is basically all I remember from it. (I'm sorry if it sounds stupid, I'm just rambling off everything I remember to be included in solving this problem.)

Uhm...I remember PV=nRT is included, as  well as...P_T = P_gas + P_H2O + _____ (I don't remember what this third one is.)

...And then there was finding out what P,V, and T equals for...I think all of the gases that were there...?

And there was a eudiometer included in the picture with water, and atmospheric pressure outside and inside the eudiometer, and things like that. And there are a lot of plugging in of numbers and moving back and forth between the equations...and stuff.

But I just don't remember how to put all those things together and what to do.

I'm sorry that everything is so vague and idiotic-sounding, I just can't seem to remember since we learned all this stuff so long ago. I'm studying for my finals now and pretty much everything is scattered...so I'm pretty much dead meat, but I'd really appreciate any help anybody can give. Thanks. ^^; And once again, really sorry for the manner in which I posted my question...if I could do it better, trust me, I would...

[DevaDevil]

the question is indeed vague

Gaslaw: pV = nRT

Anyway, p_Total = S p_i (or in words: the sum of the partial pressures)
so the pressure you have to enter in the gaslaw (the total pressure of the gasmix) is the sum of all the partial pressures of the gaseous components. That includes the water vapor as well as the dry gas. So there is only a third component if for example there is air as well. It all depends on the components of the gas mixture.

V is the total volume the gases occupy in the system, T the temperature of the gases.
And n is of course the total number of moles in the mixture.


Now if you only could tell me what the exact problem is, (with given variables and unknowns) I could try to give an approach, but your question is a bit vague on that.