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Because on one side you have two hydrogens and two oxygens and on the other side of the equation you have two hydrogens and only one oxygen.

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13y ago
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6mo ago

The chemical equation H2 + O2 -> H2O is not balanced because the number of oxygen atoms is not equal on both sides of the equation. There are two oxygen atoms on the left side (O2) and only one on the right side (H2O). Balancing the equation would require adding a coefficient of 2 in front of H2O to have an equal number of oxygen atoms on both sides.

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Q: Why is the chemical equation H2 plus O2 equals H2O is not balanced?
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