15. Iron reacts with oxygen to give iron(III) oxide, Fe2O3. (a) Write a balanced equation for this reaction. (b) An ordinary iron nail (assumed to be pure iron) has a mass of 5.58 g; calculate the mass (in grams) of Fe2O3 that is produced when the nail is converted completely to Fe2O3. (c) Calculate the mass of O2 (in grams) required for the reaction.

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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".