Question

Al → Al2S3 → AlCl3 → Al(OH)3 → Al2O3

Answer 1

2Al + 3S = Al₂S₃.
Al₂S₃ + 6HCl = 2AlCl₃ + 3H₂S↑.
AlCl₃ + 3KOH = Al(OH)₃↓ + 3KCl.
2Al(OH)₃ t° → Al₂O₃ + 3H₂O.

Answer 2

2Al+3S=Al2S3
Al2S3+6HCl=3H2S+2AlCl3
AlCl3+3NaOH=3NaCl+Al(OH)3
2Al(OH)3=t=Al2O3+3H2O