Write a balanced equation for the combination reaction described, using the smallest possible integer coefficients. When carbon monoxide combines with oxygen, carbon dioxide is formed.

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.