A 3.0-L bulb containing He at 145 mm Hg is connected by a valve to a 2.0-L

Question:

A 3.0-L bulb containing He at 145 mm Hg is connected by a valve to a 2.0-L bulb containing Ar at 355 mm Hg (see figure). Calculate the partial pressure of each gas and the total pressure after the valve between the flasks is opened. Before mixing He V = 3.0 L P = 145 mm Hg He + Ar Ar V = 2.0 L P = 355 mm Hg Valve open to After mixing He + Ar