Stoichiometry basics

In Greek stoikhein means element and metron means measure, so stoichiometry translates to the measure of elements. Stoichiometry involves using the relationships between reactants and/or products in a chemical reaction to determine desired quantitative data.

https://www.tes.com/lessons/ca4Wkej7zYnjWQ/solution-stoichiometry-ap-chemistry

This can help us find how many grams of product will be produced, how many grams of reactants are needed to react with another reactant to form a certain product, etc.