The molecular weight of ammonium metatungstate is 2974.32 g/mol. This value is obtained by adding the atomic weights of each element in the ammonium metatungstate molecule. In the ammonium metatungstate molecule, the relative atomic mass of the hydrogen atom is 1, that of the oxygen atom is 16, that of the tungsten atom is 184, and that of the nitrogen atom in the ammonium ion is 14, and that of the hydrogen atom is 1. Therefore, the calculated molecular weight of the ammonium metatungstate molecule is (6 x 14) + (2 x 1) + (12 x 184) + (40 x 16) = 2974.32 g/mol.
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