When a 12.259-g sample of a compound containing only copper and oxygen was decomposed it produced 2.410 g of oxygen. A second sample of the compound produced 1.734 g of oxygen when it was decomposed. How many grams of copper were in this second sample? (Include the unit in your answer, for example 3.475 g)

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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".