`a)`

`Hh:Al:x(mol);Zn:y(mol)`

`27x+65y=3,68(1)`

`2Al+3H_2SO_4->Al_2(SO_4)_3+3H_2`

`Zn+H_2SO_4->ZnSO_4+H_2`

Theo pt:

`n_{H_2}=1,5x+y={2,24}/{22,4}=0,1(2)`

`(1)(2)->x=y=0,04`

`\%m_{Al}={0,04.27}/{3,68}.100\%=29,35\%`

`%m_{Zn}=100-29,35=70,65\%`

`b)`

`n_{H_2SO_4\ bd}={147.10\%}/{98}=0,15(mol)`

Theo pt:

`n_{H_2SO_4\ pu}=n_{H_2}=0,1(mol)`

`n_{Al_2(SO_4)_3}=0,5x=0,02(mol)`

`n_{ZnSO_4}=y=0,04(mol)`

`m_{dd\ sau}=3,68+147-0,1.2=150,48(g)`

`C\%_{H_2SO_4\ du}={98(0,15-0,1)}/{150,48}.100\%=3,26\%`

`C\%_{Al_2(SO_4)_3}={0,02.342}/{150,48}.100\%=4,55\%`

`C\%_{ZnSO_4}={0,04.161}/{150,48}.100\%=4,28\%`