FeO3 is a non-exsisting iron oxide.
Possible oxides of iron are FeO (ferrous oxide) and Fe2O3 (ferric oxide) and all kind of 'mixtures' of both (oxydules).
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What is a unknown cation
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feo3
FeO2= is a ferric ion where FeO3- is a ferrous ion.
First, this would be an compound, not an element. Second, it does not exist. If it did exist it would be iron VI oxide, but iron cannot reach such a high oxidation state. However, there is Fe2O3, which is iron III oxide.
FeO3 = 103.845 g/mol Fe = 55.845 g/mol (55.845 g/103.845 g) x 100% = 53.8% Fe in 2FeO3
FeO3 is a compound because it is a chemical substance composed of a fixed ratio of iron (Fe) and oxygen (O) atoms in a specific arrangement. Mixtures, on the other hand, consist of two or more substances physically combined without chemical bonding.
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Fe3O4 is actually a combination of two compounds, Fe2O3 and FeO. The first is called ferric oxide and the second is ferrous oxide. Fe3o4 is also called fericc fero oxide.
What is a unknown cation
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Unknown mens the name its self "unknown"
It they are unknown how would we know if they are unknown