The 6 oxygen atoms present at the beginning of a chemical reaction will remain the same i.e., 6 even when the reaction is over.
A chemical reaction is the process in which one or more substance, called reactant undergo a chemical change and are converted into another substances called the product. The atoms or elements present at the beginning of the reaction remains the same in amount even after the reaction. They are just transferred from molecular form to another.
For example, let us consider the following reaction
HCl + KOH → KCl + H₂O
Here, the amounts or numbers of the elements remain same on both sides of the arrow i.e. on the reactant side as well as on the product side.
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