Ответ:

Объяснение:

Mr(Al2(SO3)3) = 27*2 + 32*3 + 16*9 =294

W(Al) = Ar(Al) *n / Mr(Al2(SO3)3)  *100% = 27*2 / 294  *100% =18%

W(S) = Ar(S) *n / Mr(Al2(SO3)3)  *100% = 32*3 / 294  *100% =33%

W(O) = Ar(O) *n / Mr(Al2(SO3)3)  *100% = 16*9 / 294  *100% =49%