An insulated 10.0-L tank containing compressed Ar(g) at 20.0 atm and 400. K is connected to an un-insulated 20.0-L tank containing compressed Ne(g) at 10.0 atm and 300. K by a closed valve. When the valve is opened and the contents of the tanks allowed to mix and reach 300. K: What is the mole fraction of Ar in the mixture? What is the measured pressure (in atm)? What is the partial pressure (in atm) of Ar in the mixture?