In which chemical equation is the number of atoms in the reactants, the same as the number of atoms in the products

One example of a chemical equation where the number of atoms in the reactants is the same as the number of atoms in the products is the decomposition of hydrogen peroxide (H2O2) into water (H2O) and oxygen (O2).

The chemical equation for this reaction is:

2 H2O2 -> 2 H2O + O2

In a balanced chemical equation, the number of atoms in the reactants will always be the same as the number of atoms in the products. This is because of the Law of Conservation of Mass, which states that matter cannot be created or destroyed in a chemical reaction, only rearranged. So, the total number of atoms on the reactant side of the equation should be equal to the total number of atoms on the product side.