Aluminum is reacted with oxygen to produce aluminum oxide.  There was enough aluminum and oxygen to produce 11.8 grams of calcium oxide, but after weighing the product the actual yield was only 6.2 grams of aluminum oxide.  What is the percent yield of aluminum

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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".