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In the reaction of magnesium with oxygen, if 2 formula units of magnesium oxide are formed, how many \(\mathrm{O_2}\) molecules are needed to balance the equation?

Answer and explanation

Correct answer: One

The balanced equation is \(2\mathrm{Mg}+\mathrm{O_2}\rightarrow2\mathrm{MgO}\). \(2\mathrm{MgO}\) contains a total of 2 oxygen atoms, and one \(\mathrm{O_2}\) molecule also contains 2 oxygen atoms. Therefore, the coefficient of \(\mathrm{O_2}\) is 1. Choosing “two” would provide 4 oxygen atoms, so the equation would not be balanced.

Related tags

ScienceClass 10Chemical ReactionsBalancing EquationsMagnesium Oxide

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