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Ammonium dichromate, reagent, 99.0+%, 50g CAS Number: 7789-09-5 Linear Formula: (NH4)2Cr2O7 Molecular Weight: 252.07 Ammonium dichromate is the inorganic compound with the formula (NH4)2Cr2O7. In this compound, as in all chromates and dichromates, chromium is in a +6 oxidation state, commonly known as hexavalent chromium. It is a salt consisting of ammonium ions and dichromate ions.