Question

In H2 O2 -->H2O+O2 reactant and product side number of atoms in H, O is how much?
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Answer 1

Explanation:

On the left side, the reactant side, there are 2 hydrogen atoms and 2 oxygen atoms. On the right side, the product side, there are 2 hydrogen atoms and only 1 oxygen atom. An important thing to remember when balancing equations is that the molecules themselves may not be changed—only their coefficients can.