2 tanks (X,Y) of gas are connected by a closed valve. Tank X is 5 liters and has oxygen gas at a pressure of 24 atm. Tank Y has 3 liters and has N2 gas at a pressure of 32 atm. tanks X & Y are held at the same temperature. The valve between these Tanks X and Y is opened and the gases are permissible to mix. After the gases have had time to mix, calculate the partial pressure of the oxygen gas?