Problem: The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in the reactants? 2 H2O → 2 H2 + O2

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We're being asked to determine the number of oxygen atoms in the reactants.

Given reaction: 2 H2O → 2 H2 + O2

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The following balanced equation shows the decomposition of water (H2O). According to the equation, how many oxygen atoms are in the reactants? 

2 H2O → 2 H2 + O2

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