The exact molecular weight varies due to the difference in the number x of water molecules. However, the molecular weight of ammonium metatungstate is about 2974.32000 (without water molecules).
The molecular weight of ammonium metatungstate hydrate varies depending on the number x of its water of crystallization. In general, its molecular formula can be expressed as (NH4)6H2W12O40-xH2O. In the absence of water of crystallization (i.e., x=0), the molecular weight of ammonium metatungstate is about 2956.30 (or, according to some sources, may be 2974.3). However, when considering the hydrate form, the molecular weight will increase by approximately 18 (the molecular weight of water) for each additional water molecule (H2O). To determine the exact molecular weight of ammonium metatungstate hydrate, it is necessary to know the specific number of water molecules x. In practice, this value may vary depending on the method and conditions of preparation of the product. Therefore, in the absence of a specific value for x, only an approximate molecular weight range or an estimate based on the common degree of hydration can be given.
Therefore, the molecular weight of ammonium metatungstate hydrate is not a fixed value, but varies according to the degree of hydration. If precise molecular weight information is required, the specific specifications of the product should be referred to or a chemical analysis should be performed to determine the number of water moleculesx.
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