2. A 1.1324 g sample of an iron ore is dissolved in acid. The iron is oxidized to a +3 state and is precipitated as Fe₂O3.xH₂O. The precipate is filtered, washed and ignited to Fe₂O3 (159.69 g mol-¹). 0.5394 g Fe₂O3 is produced. The reaction is 2Fe³+ Fe₂O3(s). Calculate the percentage of Fe3O4 (231.54 g mol-¹) in the sample. Fe (55.847 g mol-¹)

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Stoichiometry

Stoichiometry is a chemical division that evaluates the quantitative content of the chemical process with the help of the reacting molecules or products taking part in the reaction. The term “stoicheion” in “Stoichiometry”, is an old Greek term for "element" whereas “metron” means "measure".