# Maybe you know this one..

posted by .

Heyy, I posted this before but it kinda got pushed down and ignored, and I was hoping maybe DrBob might have an idea since no one else did! okay I have this question about chemistry and its driving me nuts. It feels like I am so close but am just missing something. The question is:

A vessel of 6.84 L in volume contains 3.61 L of pure water at 25°C. A partial pressure of 3.67 atm of CO2 is quickly injected into the space above the water. Calculate the partial pressure of carbon dioxide remaining once the solution has become saturated with the gas. Henry's constant for CO2 at this temperature is 0.0350 M atm-1

Okay so I know basically this...we dicussed with some other people and rearrganed equations and basically got this:
(mol initial - mol final)/V = concentration x pressure.

so the initial moles you get using PV=NRT, so N=PV/RT and same for moles final (diff volumes used of course) but I think that's where I'm messing up. Because after that you divide by a volume, then by the concentration. But I think I'm messing up what volumes go where. I know what the answer ius supposed to be and I cant get it for the life of me. I'm thinking that for inital moles the volume would be 6.84 cause that's the whole thing. And then I'm thinking for final moles it would be 3.61 cause that's where the liquid is. But I don't know what I would divde by...the leftover 3.23? anyways I've tried many combinations and I cant get it. ANy help would be greatly apprecaited. I could be totally on the wrong track. Thanks

Please indicate your subject in the Subject line. That way, the specialists will know to look at your post. Below is a list of subjects to put in the Subject line; please use whatever fits or include your own specific subject area:

Science
Math
Chemistry
Physics
Biology
Algebra
Geometry
Trig
Pre-calc
Calculus
Statistics
(etc.)

Thanks.

=)

## Respond to this Question

 First Name School Subject Your Answer

## Similar Questions

1. ### Chemistry

Heyy, okay I have this chemistry assingmnet and its on kinetics, and I got every single one except this one question and I've been trying for over an hour. I know that I'm probably jus tmissing something but everything I've tried doesnt …
2. ### Early Child Ed.

Yes. Temper tantrums are usually caused by a child's frustrations and is strictly emotional. B. is the best answer. By the way, beware of any answer that says "always" or "never." When you're working with people, there are almost no …
3. ### For DrBob

Hey DrBob, I posted an answer to you question on my lab report just to let you know what the y= and r^2 is
4. ### Chemistry; to drwls or drbob

i think i have posted this before except i forgot to put the decimal in the temperature. i was hoping you could help me now that it might make more sense. The total pressure in a flask containing air and ethanol at 25.7 C is 878 mm …
5. ### Dr.Bob can you check out the question down the pg

I posted a question yesterday. I was hoping to catch you before you left on your getaway. =D
6. ### Dr.Bob => Can you see the post down the pg by me

I'm trying to post this again..(assuming you didn't see the one below) I posted a question yesterday. I was hoping to catch you before you left on your getaway. =D
7. ### Advice...about chemistry degree Dr.Bob

Based on the question topic posted by Britney below titled:In your opinion (your answer to this reminded me of something) (I posted the same thing there but I thought it was improper to piggyback on that post so I posted this under …
8. ### DrBob+Thanks!

Drbob, your explanation is very clear and I learned alot out of it. I also have one last question to ask you. I posted it at my last post.
9. ### Chemistry

Determine the unknown quantity in the following cell at 298.15 K. Pt(s) | H2(g, 1.0 bar)| H+(pH = ?
10. ### english

at school i am reaing the kite runner as the class novel. i have one comprehension question im notsure how to answer. can somebody help me. the question is: the novel begins with a flashback. what do you think is its purpose?

More Similar Questions

Post a New Question