TN1:

`X:Al:x(mol);Fe:y(mol);Cu:z(mol)`

`->27x+56y+64z=47,6(1)`

Bte: `3x+3y+2z=2n_{SO_2}=2.{29,12}/{22,4}=2,6(2)`

TN2:

`X:Al:kx(mol);Fe:ky(mol);Cu:kz(mol)`

`->k(x+y+z)=0,5(3)`

`2Al+6HCl->2AlCl_3+3H_2`

`Fe+2HCl->FeCl_2+H_2`

`->n_{H_2}=1,5kx+ky={8,96}/{22,4}=0,4(4)`

`(3)(4)->{x+y+z}/{1,5x+y}={0,5}/{0,4}=1,25`

`->x+y+z=1,875x+1,25y`

`->0,875x+0,25y-z=0(5)`

`(1)(2)(5)->x=0,4;y=0,2;z=0,4`

`\%m_{Al}={0,4.27}/{47,6}.100\%=22,69\%`

`\%m_{Fe}={0,2.56}/{47,6}.100\%=23,53\%`

`\%m_{Cu}=100-23,53-22,69=53,78\%`