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A student writes \(H_2O_2\) instead of \(H_2O\) while balancing the equation \(H_2 + O_2 \rightarrow H_2O\). What is the correct way to correct this error?

Answer and explanation

Correct answer: Use coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\)

When balancing an equation, chemical formulae and subscripts must not be changed because doing so changes the substance. \(H_2O\) is water, whereas \(H_2O_2\) is hydrogen peroxide. The equation is balanced by using coefficients only: \(2H_2 + O_2 \rightarrow 2H_2O\). It has 4 hydrogen atoms and 2 oxygen atoms on each side. Changing \(O_2\) to \(O\) is also incorrect because it changes the chemical formula of oxygen.

Related tags

Chemical EquationsBalancing EquationsChemical FormulaeConservation Of MassClass 10 Science

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