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According to the conservation of mass, no atom can be created nor destroyed in a reaction. This means that we cannot insert or remove any atom into a reaction as we please. What we can do however, is manipulate the whole numbers of moles (stoichiometric coefficients) to balance the equation out.
The purpose of balancing chemical reactions is to ensure the conservation of mass, meaning atoms are not created or destroyed during a chemical reaction. Thus, you may only add stoichiometric coefficients to the front of each molecule in order to change the ratio of moles of each molecule. You cannot change the amount of a certain atom in a molecule.
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