Respuesta :
The answer is To conform to the law of conservation of mass
The law of conservation of mass state that the mass couldn't be produced or destroyed. The equation of chemical reaction should always balanced because the mass of the product should be equal to the mass of the reactant. is done to make. The law of definite proportions should not have any relevance to this.
Chemical equations have reactants to its left and products to its right. It is natural that number of atoms of each element in the reactants must be balanced with the number of atoms of those elements in the products also. This is called balancing of the chemical equation.