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Inorganic : gases
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 Message 3 of 3 in Discussion 
From: MSN Nickname·Steve·  in response to Message 2Sent: 12/18/2004 9:31 AM
Ack!  I used the wrong temperature the first time, so here it is again using T = 298.15 K ! 
 
 
Something like that can work, but it may be easier to just use PV = nRT before and after mixing:

1.  Before allowing the gases to mix,

     moles of gas A,  nA  =  PAVA / RT  =  16.4500 moles

     moles of gas B,  nB  =  PBVB / RT  =  0.388291 VB moles


2.  After allowing the gases to mix,

     PTVT  =  nTRT

     where PT  =  8.71 atm,  VT  =  48.2 L  +  VB,  and  nT  =  16.4500 moles  +  0.388291 VB moles.
 
     Or, plugging in the numbers and leaving off the units for simplicity, we'll have

     (8.71) (48.2 + VB)  =  (16.4500 + 0.388291 VB) (0.08206) (298.15)

     From which we can get VB.
 
 
Steve