question archive The equation ##H_2O_2## --> ##H_2O## + ##O_2## is not a balanced equation
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The equation ##H_2O_2## --> ##H_2O## + ##O_2## is not a balanced equation. There are two hydrogen atoms on both sides of the equation but there are two oxygen atoms on the reactant side of the equation but there are three on the product side of the reaction.
A balanced reaction would be
2 ##H_2O_2## --> 2 ##H_2O## + ##O_2## which would have four hydrogen and oxygen atoms (or moles) on both sides of the equation.
Here is a video which provides further discussion of this reaction and how to balance its equation.