The term stoichiometry is derived from two Greek words: stoicheion (meaning “element”) and metron (meaning “measure”).
Stoichiometry refers to the quantitative relationship among reactants and products in a chemical reaction that is represented through a chemical equation.
Stoichiometry calculations are based on the Law of conservation of mass. Since atoms cannot be destroyed or created -through chemical reactions-, the number and kind of atoms before and after the reactions are always the same.
Steps to resolve a stoichiometry problem
How many grams of potassium will be required to form 0.25g of Hydrogen gas through the following reaction?
2K + 2H2O → 2KOH + H2
ANOTHER METHOD TO RESOLVE THE PROBLEMS
For calculations, refer to the exercises in the videos below
Theorethical yield, actual yield and % Yield.
The amount of product that could possibly be produced in a given reaction, calculated according to the starting amount of the limiting reagent.
The amount of product actually obtained in a chemical reaction.
Refers to the efficiency of a chemical reaction; defined as the
|% Yield = actual yield x 100 |
This is an external video (not mine but very good!)