Cu(s) can react with I2(s) to make CuI (s), a compound used for seeding clouds to make rain and lots of other uses.   If 15.099 grams of Cu are combined with 20.876 grams of I2, and the reaction is allowed to proceed until one or both of the reactants are gone, what mass in grams of I2 is left over?

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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".