Answer:
2 CO(g) + O₂(g) → 2 CO₂(g)
Explanation:
Let's consider the combination reaction between carbon monoxide and oxygen to form carbon dioxide.
CO(g) + O₂(g) → CO₂(g)
We have an odd number of atoms of C on each side, so we multiply CO(g) and CO₂(g) by 2.
2 CO(g) + O₂(g) → 2 CO₂(g)
Now, the equation is balanced.