which balances the equation mg + o₂ → mgo?\no mg + 2o₂ → 4mgo\no 2mg + 2o₂ → 2mgo\no 2mg + o₂ → 2mgo\no 2mg…

Explanation:

Step1: Check Mg atoms

On the left - hand side of the unbalanced equation $Mg + O_2\rightarrow MgO$, there is 1 Mg atom and on the right - hand side, there is 1 Mg atom. To balance Mg, we can put a coefficient in front of Mg or MgO.

Step2: Check O atoms

There are 2 O atoms in $O_2$ on the left - hand side and 1 O atom in MgO on the right - hand side. To balance the O atoms, we need 2 moles of MgO. Since we now have 2 Mg atoms in 2MgO on the right - hand side, we need 2 moles of Mg on the left - hand side. So the balanced equation is $2Mg+O_2\rightarrow 2MgO$.

Answer:

C. $2Mg + O_2\rightarrow 2MgO$