                       
 C  ＋O  ——→ CO   ＋                  
                                            
  4Fe＋3O——→ 2FeO＋ 
                                                                   
S＋O——→SO＋
                     
                                                                              H
                                                                        |                                 H/
                                                            2H—C—O—H＋O→2   C＝0＋2HO
                                                                        |                                 H\
                                                                       H
                                                                                             
                                                                       —                                          FeO     ＋      3H—————→    2Fe＋3HO
                                                                                                                                        
                                   2H＋O——→2HO＋ 
          
                                       —                                     —                         Fe          Fe＋3         O2－                  —                                                                                                        &＋
                                                                                O＝S＝O
                                                                                &－        &－
                                                                     
               
  a     
  b      
  c      
                
  a     
  b     
  c     