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In the balanced reaction for burning magnesium, if one molecule of oxygen
(
ext{O}_2
)
is used, how many magnesium atoms are required?

Answer and explanation

Correct answer: Two

The balanced equation is
2 ext{Mg}+ ext{O}_2
ightarrow2 ext{MgO}
. One
ext{O}_2
molecule contains two oxygen atoms, so two Mg atoms form two units of MgO. Therefore, two magnesium atoms are required. Using only one magnesium atom would leave the equation unbalanced.

Related tags

ScienceClass 10Chemical ReactionsChemical EquationsMagnesiumBalancing Equations

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