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To calculate the amount of oxygen needed to oxidize iron, we need to use the stoichiometry of the reaction. The equation for the reaction of iron with oxygen to form iron(III) oxide is: 4 Fe + 3 O2 -> 2 Fe2O3. This shows that 3 mol of O2 are required to react with 4 mol of Fe. So, we first need to calculate the number of moles of Fe in 140 g of Iron, then use the stoichiometry to determine the number of moles of O2 needed. The molar mass of Iron(III) oxide (Fe2O3) is 159.69 g/mol.

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1y ago

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