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When the reaction of magnesium burning in oxygen is balanced, what coefficient is placed before magnesium oxide?

Answer and explanation

Correct answer: Two

The unbalanced equation is \(\mathrm{Mg + O_2 \rightarrow MgO}\). There are 2 oxygen atoms on the left, so a coefficient of 2 is placed before \(\mathrm{MgO}\): \(\mathrm{Mg + O_2 \rightarrow 2MgO}\). There are then 2 magnesium atoms on the right, so placing 2 before magnesium gives the balanced equation \(\mathrm{2Mg + O_2 \rightarrow 2MgO}\). Therefore, the correct coefficient is 2; using 1 would leave the oxygen atoms unbalanced.

Related tags

ScienceClass10Chemical ReactionsChemical EquationsBalancing EquationsMagnesium Oxide

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