A 0.5962 g sample of iron ore is dissolved in perchloric acid (HClO4 ). All iron present is oxidized to Fe3+ . The solution is filtered to remove solid matrix materials and made basic with addition of ammonium hydroxide. The iron precipitates as the Fe(OH)3 • x H2O gel. The precipitate is collected in a cistern crucible and ignited to produce Fe2O3 . What is the percent by weight of iron in the sample if the analysis produced 0.3210 g Fe2O3?

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