5.21 describe the manufacture of ammonia by the Haber process, including the essential conditions

5.21 •essential conditions for the Haber process:

                     •pressure: 200 atmospheres 

                     •temperature: 450 degrees celsius 

                     •catalyst: iron 

          •the iron catalyst make the reaction go faster, but doesn't affect the % yield 

          •set the pressure as high as possible for the best % yield, noting that it may be too

           expensive if it is set too high

          •lower the temperature for more % yield since the forward reaction is exothermic but if it’s too low, the rate will be too slow 

                     •450 degrees celsius is a compromise between maximum yield and speed of reaction