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If the product side of a balanced chemical equation contains two water molecules, \(2\mathrm{H_2O}\), what total number of hydrogen atoms must be present on the reactant side?

Answer and explanation

Correct answer: Four

One \(\mathrm{H_2O}\) molecule contains 2 hydrogen atoms. Therefore, \(2\mathrm{H_2O}\) contains \(2 \times 2 = 4\) hydrogen atoms. In a balanced equation, the number of atoms of each element is the same on both sides, so the reactant side must also contain 4 hydrogen atoms. The option 2 applies to only one water molecule.

Related tags

Chemical ReactionsChemical EquationsBalancing EquationsAtom CountingWater MoleculesClass 10 Science

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