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.
Frequently asked questions
What is the correct answer to this question?
Two
Why is this the correct answer?
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.
Which subject and chapter does this question cover?
This is a Class 10 Science question. Chapter: Chemical Substances – Nature and Behaviour. Topic: Chemical Reactions and Equations.
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