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Write a balanced equation for the following word equation
Magnesium + Oxygen → Magnesium oxide

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$4 M g + O_{4} \to m g$

$3 M g + O \to 2 M g o$

$2 M g + O_{2} \to 2 M g O$

$M g + O_{3} \to M g O$

answer is C.

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Detailed Solution

Since the ratio between the valency of oxygen (O) and magnesium (Mg) equals 1:1, magnesium oxide is designated by the symbol MgO.

The number of atoms in each element must be the same on the reactant and product sides of the reaction.

That is the basic concept of balancing an equation.

Magnesium + Oxygen → Magnesium oxide

$2 M g + O_{2} \to 2 M g O$

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