Pure copper may be produced by the reaction of copper(I) sulfide with excess oxygen gas as follows: Cu2S(s) + O2(g) ---> 2Cu(s) + SO2(g) What mass of copper(I) sulfide is required in order to prepare 0.610 kg of copper metal?

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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".