Question

Al → Al2O3 → Al2(So4)3 → Al(OH)3 → AlCl3

Answer 1

1) 4Al + 3O2 = 2Al2O3
2) Al2O3 + 3H2SO4 = Al2(SO4)3 + 3H2O
3) Al2(SO4)3 + 6KOH = 2Al(OH)3 + 3K2SO4
4) Al(OH)3 + 3HCl = AlCl3 + 3H2O