The chemical equation for the reaction between NH4Cl, CaCl2, Ca(OH)2, Fe(OH)2, FeCl2, and FeO is:

2NH4Cl + 3CaCl2 + 2Ca(OH)2 + Fe(OH)2 + 6FeCl2 + 6FeO

This reaction involves the formation of Ammonium chloride, Calcium chloride, Calcium hydroxide, Iron(II) hydroxide, Iron(II) chloride, and Iron(II) oxide.