The molecular weight of ammonium metatungstate hydrate varies slightly from one source to another, which may be related to the different contents of water molecules in the hydrate. some studies suggest that the molecular weight of ammonium metatungstate hydrate is given as 2956.30, while others suggest that the molecular weight of ammonium tungstate hydrate is 2974.3 or 2974.318, respectively. in order to characterize more accurately the molecular weight of ammonium metatungstate hydrate, it is value of x in its chemical formula, i.e. the number of water molecules, needs to be considered. Since the value of x may be different, the molecular weight may also vary.
Therefore, the molecular weight of ammonium metatungstate hydrate is roughly between 2956.30 and 2974.318, depending on its water molecule content.
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