Carbonic acid (H₂CO₃) is unstable and readily decomposes into carbon dioxide (CO₂) and water (H₂O). Aluminum (Al) will react with the water to form aluminum hydroxide (Al(OH)₃) and hydrogen gas (H₂). Here's the balanced equation:

3H₂CO₃(aq) + 2Al(s) → 3CO₂(g) + 3H₂O(l) + 2Al(OH)₃(s)

Explanation:

* Reactants: Carbonic acid (H₂CO₃) and aluminum (Al)

* Products: Carbon dioxide (CO₂), water (H₂O), and aluminum hydroxide (Al(OH)₃)

* Balancing:

* 3 moles of H₂CO₃ are needed to produce 3 moles of CO₂ and 3 moles of H₂O

* 2 moles of Al react with 6 moles of H₂O to form 2 moles of Al(OH)₃ and 3 moles of H₂

Note: This reaction is a combination of two separate reactions:

1. Decomposition of Carbonic Acid: H₂CO₃(aq) → CO₂(g) + H₂O(l)

2. Reaction of Aluminum with Water: 2Al(s) + 6H₂O(l) → 2Al(OH)₃(s) + 3H₂(g)