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The way that you can deduce this formula from the name is that first it starts with potassium - K, you don't know how many yet, but you know the first atom is K, and because K is a positive cation, it is outside of the brackets. Then for hexacyanido - hexa means 6 and cyanido means CN-. Then you have Cromate which means the chromium atom. So far now you have K [Cr(CN)6] - but how do we know how many K's there are? That's solved by the roman numerals that are in the name, Chromate (III). This means that chromium has a 3 plus charge, and we already know that CN has a minus one charge. Since the next compound is neutral that means we need to have 3 K+ ions to balance out the charges. Hopefully that helped.
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