Oxygen gas enters a well-insulated diffuser at 30lbf/in^2, 440degree Rankine, with a velocity of 950 ft/s through a flow area of 2.0in^2. At the exit, the flow area is 15 times the inlet area, and the velocity is 25 ft/s. The potential energy change from inlet to exit is negligible. Assuming ideal gas behavior for the oxygen and steady-state operation of the nozzle, determine the exit temperature, in degree Rankine, the exit pressure, in lbf/in^2, and the mass flow rate, in lb/s.