Stoichiometric / Non-Stoichiometric mixtures

There are two types of mixtures:

Stoichiometric mixtures: the reactants are totally consumed and the final mixture consists only of final products.

Non-stoichiometric mixtures: the reactants are not totally consumed. one of the reactants is in excess with respect to the others. the final mixture consist of the final products and the left amount of the excess reactant.

Click the following link to understand the difference between the two mixtures