The chemical equation and stoichiometric coefficients

A chemical reaction is the phenomenon that turns an unstable chemical species or mixture, under the conditions of chemical experiment, into other stable species. A reaction is represented by its chemical equation such as reaction [l.Rl], which represents the reaction between nitric oxide and hydrogen, and produces water and nitrogen  

This chemical equation, besides the chemical species being involved, includes numbers placed in front of each species (e.g. 2 for N2) that are called the arithmetic stoichiometric coefficients. The set of coefficients belonging to a reaction may be multiphed or divided by the same number without modifying the reaction in any way. For example, the above reaction could also be written by multiplying all the stoichiometric coefficients by two in the following  

These coefficients (integer or fractional) indicate the proportions of species that are involved in the reaction. For example, in reaction [l. Rl] if three moles of nitric oxide react with three moles of hydrogen respectively, in fine, when the reaction is totally complete it will have produced three moles of water and 1.5 moles of nitrogen. 

Note 1.1.- During the kinetic study (as for the thermodynamic study) of a reaction, it is recommended we choose a set of stoichiometric coefficients and keep them. It is highly recommended to choose the same series for the kinetic and 

We state that the chemieal equation is a molar equation and it should be noted that the two members of the equation are separated by the equals sign. 

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