The gas-phase reaction CO(g) + 2 H₂(g) ⇌ CH₃OH(g) is allowed to reach equilibrium at 500 K in a closed container. The total pressure at equilibrium is 5.00 atm, and the gaseous mixture is 20.0 % CO, 50.0 % H₂, 10.0 % CH₃OH, and 20.0 % Ar by mole fraction. Determine the equilibrium constant Kp for this reaction at 500 K.