Ammonium metatungstate has the chemical formula (NH4)6W12O39.
To calculate the relative molecular mass, multiply the relative atomic mass of each atom by its number in the chemical formula and add these values together:.
Nitrogen (N) has a relative atomic mass of 14
Hydrogen (H) has a relative atomic mass of 1
Tungsten (W) has a relative atomic mass of about 183.84 (as an approximation)
The relative atomic mass of oxygen (O) is 16.
Therefore, the relative molecular mass of ammonium metatungstate is:
6 x (14 + 4 x 1) + 12 x 183.84 + 39 x 16
=6×18+12×183.84+624
=108+2206.08+624
=2938.08
Therefore, the relative molecular mass of ammonium metatungstate is approximately 2938.08.
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