Question

The stop cock connecting two bulbs of volume $5litre$ and $10litre$ containing an ideal gas at $9atm$ and $6atm$ respectively, is opened. What is the final pressure in the two bulbs if the temperature remains the same?

Answer 1

Applying mole conservation,

$P_1{V}_1+P_2{V}_2=P_R(V_1+V_2)$
$9\times 5+6\times 10=P_R\left(15\right)$
$P_R=7atm$
where, $P_R=$ resultant pressure after mixing