Chemical equilibrium help!!!! For a reaction 2SO2(g) + O2(g) ↔ 2 SO3(g), 0.1mol of each SO2 and SO3 are mixed in a 2.0L flask at 27 degrees Celsius. After Equilibrium total pressure is 2.78atm. Calculate a) The mole fraction of O2 at equilibrium b) The value of Kp I dont know how to find out the mole fraction of O2... I did the problem finding Kp.. but I got a large number of 19.31.... And my Nt at equilibrium= n(4-alpha) Any ideas??