Lesson: Chapter - 7


Stoichiometry is the branch of chemistry that deals with the quantities of substances that react and are produced by chemical reactions. Stoichiometry provides the quantitative relationship between reactants and products in a chemical reaction. For example, when methane combines with oxygen in combustion reaction, 16g of methane require 64g of oxygen.

Stoichiometry is a way of describing the quantitative relationships among elements in compounds and among substances as they undergo chemical changes.

Every chemical reaction has it's characteristic proportions. The method of obtaining these from chemical formulas, equations, atomic weights and molecular weights, and determination of what and how much is used and produced in chemical processes, is the major concern of Stoichiometry

In plain English, if you have to calculate just about anything relating to moles or other chemical quantities, the calculations will involve stoichiometry.


A mole of any atoms has a mass in grams equal to the atomic weight of the element. The term mole can be applied to any particle: atoms, a mole of atoms, a mole of ions, a mole of electrons, or a mole of molecules. Each time we use the term, we refer to a number of particles equal to the number of atoms in exactly 12 grams of the 12C isotope of carbon.

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