5.20 understand that nitrogen from air, and hydrogen form natural gas or the cracking of hydrocarbons, are used in the manufacture of ammonia

5.20 •nitrogen and hydrogen are needed to make ammonia 

        • N2(g) + 3H2(g) ------> 2NH3(g)

                                   <------

                   •we use the Haber process for this reaction

        •nitrogen is from the air (78%)

        •hydrogen comes from natural gas or cracking of hydrocarbons

                    •because it is reversible, not all will convert to ammonia, and so will reach dynamic equilibrium