Sulfur dioxide reacts with oxygen to form sulfur trioxide in the presence of a catalyst. The equilibrium constant, Kp, at a certain temperature is 3.0 × 10^22. A 2.0-liter flask has enough SO3 added to it to produce a pressure of 0.789 atm Hg. After the reaction comes to equilibrium, the expected partial pressure of O2 will be
(A)2.88 × 10^-6 torr (B)3 × 10^-18 mm Hg (C)1100 mm Hg (D)1.32 × 10^-5 torr
D