Can the formulae of the reactants and products be altered in balancing a chemical equation?
Law of constant proportion
According to this law, the chemical formulae of a compound is universally fixed. It can't be changed.
Method for balancing chemical equation
The coefficients which are present before the formulae of the reactants and the products, they need to be adjusted in such a manner that the total number of atoms on both the reactants and products sides become equal.
Hence, no, the formulae of the reactants and products can not be altered in balancing a chemical equation.