A reaction mixture initially contains .25 moles of ZnS and 0.25 moles O2. After the reaction in complete, how many moles of the excess reactant are left over? 2ZnS + 3O2 —> 2ZnO + 2SO2

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Q: Question attached

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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".