Ethylene, C2H4, and water react under appropriate conditions to give ethanol. The reaction is C2H4(g) + H2O(g) <-> C2H5OH(g) An equilibrium mixture of these gases at a certain temperature had the following partial pressures: PC2H4 = 0.606 atm, PH2O = 2.12 atm, PC2H5OH = 8.47 atm. What is the value of Kp?