Solve Chemistry Gas Problem: Pressure in System When Stopcocks Open

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Homework Statement




The apparatus shown consists of three bulbs connected by stopcocks. What is the pressure inside the system when the stopcocks are opened? Assume that the lines connnecting the bulbs have zero volume and that the termperature remains constant.

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CO_2 - Pressure : 2.13 atm , Volume = 1.5 L
H_2 : Pressure = 0.861 atm, Volume = 1.00 L
Ar : Pressure = 1.15 atm , volume = 2.00 L

Homework Equations



The equation i used was Daltons partial gas equation

P1 + p2 + p3 = ptotal

The Attempt at a Solution



so i just did 2.13 + 0.861 + 1.15

But the answer is 1.414 atm.

i dont' know what to do
 
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that would be too easy of course

hint: P1V1 = P2V2

what is V2 or V(total)?