Formula of Ammonium phosphomolybdate is 

${\left({\text{NH}}_{\text{4}}\right)}_{\text{3}}{\text{PO}}_{\text{4}}{\text{\hspace{0.17em}.\hspace{0.17em}12\hspace{0.17em}MoO}}_{\text{3}}{\text{ or (NH}}_{\text{4}}{\text{)}}_{\text{3}}{\text{PMo}}_{ }{\text{12O}}_{\text{40}}\text{.}$

Ammonium phospho molybdate is the inorganic salt of phosphomolybdic acid with the chemical formula