The formula of the iron(III) ion is Fe3+\text{Fe}^{3+}Fe3+. The formula of the dichromate(VI) ion is Cr2O72−\text{Cr}_2\text{O}_7^{2-}Cr2O72−.
Which is the correct chemical formula of iron(III) dichromate(VI)?
Fe3(Cr2O7)2\text{Fe}_3(\text{Cr}_2\text{O}_7)_2Fe3(Cr2O7)2
Fe2(Cr2O7)3\text{Fe}_2(\text{Cr}_2\text{O}_7)_3Fe2(Cr2O7)3
Fe2Cr6O21\text{Fe}_2\text{Cr}_6\text{O}_{21}Fe2Cr6O21
Fe(Cr2O7)3\text{Fe}(\text{Cr}_2\text{O}_7)_3Fe(Cr2O7)3
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