What Is the Molecular Formula of Ammonium Metatungstate? 2023-02-27 Tungsten Oxide 187 The molecular formula of ammonium metatungstate is (NH4)6[H2W12O40], which indicates that it consists of six ammonium ions, one hydrogen tungstate ion, and twelve tungstate ions. 0 0 ammonium metatungstatemolecular formula