A rigid tank that contains 3 kg of N2 at 25oC and 250 kPa is connected to

Question:

A rigid tank that contains 3 kg of N2 at 25oC and 250 kPa is connected to another rigid tank that contains 2 kg of O2 at 25oC and 450 kPa. The valve connecting the two tanks is opened, and the two gases are allowed to mix. If the final mixture temperature is 25oC, determine
(a) The volume () of each tank
(b) The final mixture pressure (pm). Use the IG Model.