[audienne]

A flask contains 2 L of Hydrogen at 300kPa pressure. A second flask contains 6L of Argon at 100kPa pressure.  If the flasks are connected, what will be the final pressure, the temperature remaining constant throughout.


Total volume = 2 + 6 = 8 L

100 =  (total pressure x 2)/8
                         

Total pressure = 400 kPa

[Astrokel]

You have to calculate change in pressure due to the change in volume of each gase after mixing and sum the two pressures up.