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In the balanced equation for burning magnesium, \(2\mathrm{Mg}+\mathrm{O}_2\rightarrow2\mathrm{MgO}\), how many oxygen atoms are present on the product side?

Answer and explanation

Correct answer: Two

The product side contains \(2\mathrm{MgO}\). Each formula unit of \(\mathrm{MgO}\) has 1 oxygen atom, and the coefficient 2 means there are 2 such units. Thus, the total number of oxygen atoms is \(2\times1=2\). Do not confuse this with the subscript 2 in \(\mathrm{O}_2\), which shows the number of atoms in one oxygen molecule on the reactant side.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsMagnesium OxideBalancing Equations

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