Answer:
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Explanation:
Let's consider the unbalanced molecular equation when aluminum metal and oxygen gas combine to produce aluminum oxide. This is a combination reaction.
Al(s) + O₂(g) ⇒ Al₂O₃(s)
We can balance O atoms by multiplying O₂ by 3 and Al₂O₃ by 2.
Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
Finally, we multiply Al by 4 to get the balanced equation.
4 Al(s) + 3 O₂(g) ⇒ 2 Al₂O₃(s)
