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In the balanced combustion reaction of magnesium, if \(2\mathrm{MgO}\) is written on the product side, how many magnesium atoms must be on the reactant side?

Answer and explanation

Correct answer: Two

Each \(\mathrm{MgO}\) unit contains one magnesium atom. Therefore, \(2\mathrm{MgO}\) contains two magnesium atoms in total. To conserve atoms on both sides, the reactant side must contain \(2\mathrm{Mg}\). Oxygen is written as \(\mathrm{O}_2\), but this does not change the number of magnesium atoms required.

Related tags

ScienceClass-10Chemical-ReactionsChemical-EquationsBalancing-EquationsMagnesium-Oxide

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