Magnesium reacts with oxygen gas to form magnesium oxide. Which of the following represents the balanced chemical equation?

Mg + O2 - -> MgO

Mg + O2 - -> 2MgO

2Mg + 2O2 - -> 2MgO

2Mg + O2 - -> 2MgO

2Mg + O2 → 2MgO

Explanation:

Step 1: Data given

Magnesium = Mg

Oxygen = O2

magnesiumoxide = MgO

Step 2: The unbalanced equation

Mg + O2 → MgO

Step 3: Balancing the equation

On the left we have 2x O so on there right, we should mulitply MgO by 2 so we have on each side 2x O

Mg + O2 → 2MgO

On hte right side we have 2x Mg, so we have to multiply on the left side Mg by 2 to have the same amount of Mg on both sides

2Mg + O2 → 2MgO

Now the equation is balanced