Question

Balance the chemical equation: Mg + O2 → MgO

Answer 1

2Mg + O2 --> 2MgO

Step-by-step explanation:

You see that O2 requires 2 oxygen so you add 2 in front of the MgO.

Mg + O2 --> 2MgO

Then you would add 2 to the Mg because now that MgO has 2 of each, Mg is missing another one.

2Mg + O2 --> 2MgO