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Magnesium + oxygen yields MgO. Choose the simplest balanced equation.

AMg + O2 -> MgO
BMg + O2 -> 2MgO
C2Mg + 2O2 -> 2MgO
D2Mg + O2 -> 2MgO
Answer & Solution
Correct answer: D. 2Mg + O2 -> 2MgO
One oxygen molecule supplies two oxygen atoms, which combine with two magnesium atoms to give two MgO units.
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