The Haber-Bosch process produces ammonia through a direct connection of nitrogen and hydrogen under pressure conditions and constant temperature: N2 + 3H2 = 2NH3. The partial pressures x, y and z of hydrogen, nitrogen and ammonia satisfy the relationship x + y + z = P and the law of equilibrium z^2 / x*y^3 = k.The maximum amount of ammonia is obtained when its partial pressure is maximum.Determine the maximum value of (partial pressure of ammonia)