Air is confined to one side of a rigid chamber, divided by a partition. The other side is initially evacuated. The air is initially at 5 bar, 500 K and 0.2m3. When the partition is removed, the air expands to fill the entire chamber. Measurements show that the final volume is double the initial and the final pressure is 25% of the initial. Assuming that air behaves as an ideal gas, determine the final temperature in K and the heat transfer in kJ.