reaction mixture initially contains 0.25 moles of ZnS and 0.25 moles of O2. after the reaction is complete. how many ,oles of the excess reactant are left over?  2 ZnS+3 O2---> + 2 SO2 0.250 moles O2 0.125 moles O2 0.083 moles ZnS 0.167 moles ZnS

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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".