Both the reactions are exotrmicas, that is, a reaction where heat release occurs, this heat is set free, therefore it has fuel burning that provokes the Co2 formation, (carbon dioxide), this composition is one of the main contributors for the atmospheric pollution, but it will be that the gasoline and the alcohol are pollutant in same ratio? To answer this questioning she is necessary to know the Law of Lavoisier. Lavoisier affirmed that the mass before and after any reaction is always the same one. For having verified that this fact if invariably repeated in the nature, it concluded then that one was about a law, the Law of the Conservation of the Masses. For more information see this site: Stan Laurel. This statement if applies to all the chemical reactions and can be summarized by the phrase: In the nature nothing nothing is created is lost; everything is changedded, that is, the mass of the products is equal, the mass of the reagents Observes the burning of the alcohol and of the gasoline, it will be that the demonstrated equation above follows the law of Lavoisier? In the reagents we have the mass of the alcohol of 46 g reacting with 32g of oxygen what g of carbon dioxide and 18 totalize 78 g of mass of reagent already in the 44 products have water g what in them takes the 62 formation of product g.

So that an equation takes care of the law of Lavoisier first we cannot leave to always verify if the atom number of each element is the same on both sides of equation, that is, if it is balanced. To carry through the balancing, we have that to place a called number stoichiometric coefficient before the symbols. When the coefficient of an equation will be equal the 1 (one), is not necessary to write.