Question

Al2(SO4)3⇒AlCl3⇒Al(OH)3⇒Al2O3⇒AlBr3

Answer 1

Al2(SO4)3 + 3 BaCl2 = 2AlCl3 + 3BaSO4↓
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl
2Al(OH)3 = Al2O3 + 3H2O
Al2O3 + 6HBr = 2AlBr3 + 3H2O

Answer 2

большое спасибо)

Answer 3

Не за что)))

Answer 4

2Al(OH)3 + 3H2SO4 = Al2(SO4)3 + 6H2O
Al2(SO4)3 + 3BaCl2 = 2AlCl3 + 3BaSO4
AlCl3 + 3NaOH = Al(OH)3 + 3NaCl 
2Al(OH)3 = Al2O3 + 3H2O 
последнее не знаю