The minerals hematite (Fe2O3) and magnetite (Fe3O4) exist in equilibrium with atmospheric oxygen: 4Fe3O4(s) + O2(g) rightarrow 6Fe2O3(s) Kp = 2.5 x 1087 at 298 K (a)Determine PO2 at equilibrium. (b)Given that PO2 in air is 0.21 atm, in which direction will the reaction proceed to reach equilibrium? a.toward reactants b.no change c.toward products