                                                                                     
      N＋N——→NH  NH                                                                                                  
                                      
                NO－   
                          
    4NH＋7O—————————→ 4NO＋6HO
                             NO－   
                        
    4NH＋9O——————→ 4NO＋6HO
                                                                                                        6—6         6—6                        1012               1012      