Consider the copper thermite reaction, a reaction between two solids that can be initiated with strong heating: 3 CuO(s) + 2 Al(s) → 3 Cu(s) + Al2O3(s) 25.0 g of copper(II) oxide are combined with 25.0 g of Al , and the mixture is heated strongly to react. molar masses (g/mol):  CuO - 79.55    Al - 26.98    Cu - 63.55 What is the chemical formula or elemental symbol for the limiting reactant?   What is the chemical formula or elemental symbol for the excess reactant?

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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".