Question

what is the correct coefficient ratio to have the equation balanced? mg + o2 → mgo 2:2:2 1:1:1 2:1:2 1:2:1

Explanation:

Step1: Balance oxygen atoms

There are 2 oxygen atoms in $O_2$ on the left - hand side. To balance the oxygen atoms, we need 2 moles of $MgO$ on the right - hand side: $Mg+O_2
ightarrow2MgO$.

Step2: Balance magnesium atoms

Since we have 2 moles of $MgO$, we need 2 moles of $Mg$ on the left - hand side. So the balanced equation is $2Mg + O_2=2MgO$.

Answer:

C. 2:1:2