A rigid, well insulated container, is outfitted with a moveable but frictionless partition that separates two sides but allows conduction between the two sides. One side has 1 kg of air, initially at 500 kPa, 350K and the other side has 3 kg of CO2 initially at 200 kPa, 450K. Determine the final temperature (K) and the final pressure (kPa) of the complete system, assuming constant specific heats.