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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 = 0.407 atm, PH2O = 3.61 atm, PC2H5OH = 7.51 atm. What is the value of Kp? Kp =