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In the burning reaction of magnesium, the coefficient of the oxygen molecule

displaystyle \(\mathrm{O_2}\) is 1. What will be the coefficient of magnesium

displaystyle \(\mathrm{Mg}\) in the balanced equation?

Answer and explanation

Correct answer: Two

The balanced equation is

displaystyle \(2\mathrm{Mg}+\mathrm{O_2}\rightarrow2\mathrm{MgO}\). One

displaystyle \(\mathrm{O_2}\) molecule contains 2 oxygen atoms. Since each unit of

displaystyle \(\mathrm{MgO}\) contains 1 oxygen atom, 2 units of

displaystyle \(\mathrm{MgO}\) are formed, requiring 2 magnesium atoms. Therefore, the coefficient of magnesium is 2. A coefficient of 1 would not balance the number of magnesium atoms on both sides.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsBalancing EquationsMagnesium Combustion

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