D. Molecular oxygen is contained in an rigid, insulated tank of 1.98 m volume at 1010 kPa 127C. It is connected by an insulated pipe and valve to a second rigid, insulated tank of 0.675 m volume which is completely evacuated. The valve is opened and the oxygen in the two tanks reaches equilibrium. 6. (10 pts) In D, what is the mass of molecular oxygen in the tank? 7. (10 pts) In D, what is internal energy change during the process? 8. (10 pts) In D, what is the final pressure of the oxygen in the two tanks? Pfin m02 AU kg KJ kPa