Two flasks are connected with a stopwingspan. The first flask has a volume of
5 liters and contains nitrogen gas at a pressure of 0.75 atm. The second
flask has a volume of 8 L and contains oxygen gas at a pressure of 1.25
atm. When the stopwingspan between the flasks is opened and the gases are
free to mix, what will the pressure be in the resulting mixture?

Question

Two flasks are connected with a stopwingspan. The first flask has a volume of
5 liters and contains nitrogen gas at a pressure of 0.75 atm. The second
flask has a volume of 8 L and contains oxygen gas at a pressure of 1.25
atm. When the stopwingspan between the flasks is opened and the gases are
free to mix, what will the pressure be in the resulting mixture?

anonymous · Answer

pV = nRT
p = (0.75 * 5 + 1.25 * 8) / (5 +8) = 1.06 atm

anonymous · Answer

I think that's correct @AccessDenied

accessdenied · Answer

I think it is correct, although I was going to use Boyle's Law and Dalton's Law instead:
   P1 V1 = P2 V2
 (a)    0.75 atm * 5L = P2 * 13 L   P2 = 0.75*5/13 atm
  (b)   1.25 atm * 8L = P2 * 13L    P2 = 1.25*8/13 atm
Dalton's Law:  P_total = P_O2 + P_N2  =  0.75*5/13 + 1.25*8/13 = (.075*5 + 1.25*8)/13 atm

maybe i'm just not used to it but it did not appear obvious from that work to me.

anonymous · Answer

Great! xD

anonymous · Answer

Thank you