In ammonium-phosphomolybdate, the oxidation state of Mo is +_______
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Phosphomolybdate is an anion containing both phosphorus and molybdenum, with the chemical formula (NH 4 ) 3 PO 4 .12 MoO 3 .
The ammonium ion has a total charge of+3, and the phosphate ion has a total charge of -3. Therefore, the 12 MoO 3 units in the compound must have a total charge of+3 - (-3) = + 6.
Each MoO 3 unit contains one Mo atom and three O atoms. The total oxidation state of the three O atoms is -6, since each O atom has an oxidation state of —2.
So
Mo + (-6) = 0
Mo = +6
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