làm nhanh giúp mình ạa

`4)`

`n_{Mg}=x(mol);n_{Al}=y(mol);n_{Fe}=z(mol)`

`Mg+2HCl->MgCl_2+H_2`

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

`Fe+2HCl->FeCl_2+H_2`

`n_{H_2(Mg)}=x(mol);n_{H_2(Al)}=1,5y(mol);n_{H_2(Fe)}=z(mol)`

`->x:1,5y:z=1:2:4`

`->24x:27y:56z=24:(2.18):(4.56)=24:36:224=6:9:56`

`->m_{Mg}:m_{Al}:m_{Fe}=6:9:56`

`5)`

`a)`

`A:C_xH_y`

`M_A=0,5.32=16(g//mol)`

`x={16.75\%}/{12}=1`

`y={16.25\%}/{1}=4`

`->A:CH_4`

`b)`

`CH_4+2O_2` $\xrightarrow{t^o}$ `CO_2+2H_2O`

`->V_{O_2}=2V_{CH_4}=4(L)`

`->V_{kk}={4}/{20\%}=20(L)`

`6)`

`a)`

`M_{hh}={0,1.32+0,15.28+0,25.44}/{0,1+0,15+0,25}=36,8(g//mol)`

`b)`

`d_{hh//kk}={36,8}/{29}=1,27`

`d_{hh//H_2}={36,8}/2=18,4`