Chemistry Help Forum Partial Pressures question

 Sep 28th 2011, 08:02 PM #1 HelpmePLEASE Junior Member   Join Date: Apr 2011 Posts: 6 Partial Pressures question I'm not 100% sure how to solve this I tried using grahams law pv=nrt and even daltons partial pressure but I just cant so here it is: Two chambers are connected by a valve. One chamber has a volume of 15.0 L and contains N2 gas at a pressure of 2.00 atm. The other has a volume of 1.50 L and contains O2 gas at a pressure of 3.00 atm. The valve is opened and the gases mix what is the final pressure in the system in atm? I'm 100% sure it must regard effusion but I just don't know how
 Sep 28th 2011, 10:19 PM #2 Unknown008 Senior Member     Join Date: May 2010 Location: Mauritius Posts: 1,685 Grahams Law, I would think is enough to solve this. Assuming that T is constant, the total number of moles n is given by PV/RT. So, P1V1/RT + P2V2/RT = PtVt/RT Which gives: P1V1 + P2V2 = PtVt You have P1, V1, P2, V2 and Vt is adding V1 and V2. Can you solve for Pt? t is total by the way. __________________ Jerry (Working, studying, writing and drawing :3) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying? Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. Thank you for leaving a reputation to my post
 Oct 4th 2011, 04:39 PM #3 HelpmePLEASE Junior Member   Join Date: Apr 2011 Posts: 6 ya I got it thanks man!
 Oct 4th 2011, 09:36 PM #4 Unknown008 Senior Member     Join Date: May 2010 Location: Mauritius Posts: 1,685 You're welcome! __________________ Jerry (Working, studying, writing and drawing :3) It is easier to protect your feet with slippers than to cover the earth with carpet. No one can go back and change a bad beginning; but anyone can start now and create a successful ending. If a problem can be solved, no need to worry about it. If it cannot be solved what is the use of worrying? Give a man a fish and you feed him for a day. Teach a man to fish and you feed him for a lifetime. Thank you for leaving a reputation to my post

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