Question

Magnesium(Mg)+Oxygen(O2)=

Answer 1

Mg+O₂=MgO₂(Magnesium Oxide)...........

Answer 2

Answer:

2Mg + O2 ---> 2MgO

Explanation:

Magnesium (Mg) has a '+2 oxidation' state. In order to balance the Oxygen (O2) in the reactant side of the reaction with the MgO in the product side, we have to add two more moles of MgO in the product side.  

Now we got 2 moles of MgO. Next, we have to balance the Mg of the reactant side of the reaction with the MgO of the product side of the reaction. MgO has 2 moles in the product side, so we have to add 2 to the Mg of reactant side.