The exact mass of ammonium metatungstate depends on the exact mass of each atom in its molecule.
Ammonium metatungstate has the molecular formula (NH₄)₆H₂W₁₂O₄₀, where:
N (nitrogen) has an atomic mass of about 14.00674 Da (Dalton)
H (hydrogen) has an atomic mass of about 1.007825 Da
W (tungsten) has an atomic mass of approx. 183.84 Da
O (oxygen) has an atomic mass of about 15.9994 Da
Therefore, the exact mass of ammonium metatungstate can be calculated as follows:
Exact mass = 6 × (14.00674 + 4 × 1.007825) + 2 × 1.007825 + 12 × 183.84 + 40 × 15.9994
This calculation will give the exact mass of the ammonium metatungstate molecule, but note that this value may vary slightly due to the presence of isotopes. However, for most applications, the above approximation (i.e., 2974.32 g/mol) is sufficiently accurate.
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