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Metals combine with polyatomic ions to give ionic compounds. This is how to calculate molar mass (average molecular weight), which is based on isotropically weighted averages. ACFrOgA0ik9UiwgcNa6Xeet4 - Course Hero Nitrogen (N), phosphorous (P), and potassium (K) are main nutrients in plant fertilizers. 7 answers. Write the name, formula, and charge for each of the co - ITProSpt Molecular weight of Iron (III) Chromate Molar mass of Fe2 (CrO4)3 = Convert grams Iron (III) Chromate to moles or moles Iron (III) Chromate to grams Molecular weight calculation: 55.845*2 + (51.9961 + 15.9994*4)*3 Percent composition by element Calculate the molecular weight of a chemical compound Enter a chemical formula: If you have a polyatomic ion, use the Common Ion table to find the formula and charge (see https://youtu.be/N4N1Njh7nCo).3. When calculating molecular weight of a chemical compound, it tells us how many grams are in one mole of that substance. Iron (II) Iodide. The positive charge (+2) of the iron (ii) ions are balanced by the negative charge of the chromate ions as shown mathematically as follows; +2 + (-2) = 0; i.e. Iron(II) Chromate FeCrO4 -- EndMemo Ferrous Chromate. There must be some specialist use Answer link. FeCrO4. Such as on combining, H + and PO 3-, the charges are crossed over to form H 3 PO 4. Use the crisscross method to check your work.Notes:- Don't write the subscript '1'.- If you use the criss-cross method and end up with something like Ca2S2 you'll need to reduce the subscripts to Ca1S1 which we write CaS.- It is possible to have two polyatomic ions such as NH4NO3. Chromate ions, CrO, on the other hand have a positive charge of -2. Ferrous Dichromate. Iron (II) Chromate. Next the iron half-reaction is considered. Used to color glazes gray, brown, or black (but can also be used to produce greens and pinks). PDF Formulas and Nomenclature of Ionic and Covalent Compounds