(Answered) A 674 kg mixed-mineral sample

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A 6.74 kg mixed-mineral sample contains chromite (FeCr₂O₄) as the only chromium-bearing ore. The sample is subjected to an industrial process, using a ferrosilicon alloy as a reducing agent, which quantitatively converts all of the chromium into 13.1 kg of a ferrochrome alloy (stainless steel) which is 13.4% Cr by mass. What is the percentage of chromite (FeCr₂O₄) in the original sample?

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