Respuesta :

4AlF₃ + 3O₂ ⇒ 2Al₂O₃ + 6F₂

4×1 = 4 Al        2×2 = 4 Al
4×3 = 12 F       2×3 = 6 O
3×2 = 6 O        6×2 = 12 F


I hope this helps you.