Fuckign Ideal Gas Laws
 

The mass of nitrogen dioxide contained in a 2.88 L vessel at 77.9°C and 815 torr is....
I get .0493 and the freaking quiz keeps telling me I am wrong.

/edit
so apparently using the correct constants is important. fucking constants. 8.13 should be the same as .082 :p

uhhh...don't quote me on this, but I think you are wrong. I got 4.93 g.

Did you convert the temp to K, and the pressure to atm? Also, did you convert the moles of the gas to grams?

peace

just saw your edit...what constant is 8.13? I thought it was 8.31 J/molK

I did, but then I used the wrong constant for R, which fubar-ed my results

pV = (alpha)nRT
Not too hard now is it?

Lol i wrote a whole program on my calculator(TI-86) to do all the calculations for me back in chem......

p=815torr
v=2.88L
n=_mol
r=62.4L*mmHg/mol*K
t=351.05K

I think that's right; been a few weeks since I had chemistry.

And if I recall correctly, torr = mmHg, right? So the constant is 62.4L*mmHg/mol*K ?

oh god. i hated chemistry. stoich killed me.

you are indeed correct.

And, for the record, the ideal gas laws are about as easy as it gets for chemistry. Yes, it is hard dealing with all of the constants and getting them in the right units, but just wait ... if you ever take quantum and you see your first triple integral looking at you with teeth .... then seven sheets of paper later (and about one to two hours), you have your answer.

By the way, you also don't use the gas laws for shit and I am a chemist so I think I should know. :)

You do in thermodynamics and resevior modelling etc. Not your everyday chemist nonesense. Today mostly the variants have been built into programs like Hysys so even if you don't get it , it should be ok. :D

I'm a math major. triple integrals wern't that bad. Linear Algebra from a Matrix Perspective, that class was wicked hard.