[rajm95]

hello guys,

could somebody help me solve this problem:

the Chromium present on a mineral sample weighs 0.2g, it was oxidated with Na2O2 to form CrO4^2-.
the solution was acidificated and treated with 0.7595g of pure FeSO4.
the excess of Fe+ used 10ml of K2Cr2O7 0.0167M  in a acidic medium.
¿calculate the % of Cr2O3 in the mineral?

[billnotgatez]

@rajm95
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