[imath]n_{SO_2}[/imath]=1,05
Gọi x,y,z là số mol
a)
TN1:
[imath]Mg + 2H_2SO_4 \to MgSO_4 + SO_2 + 2H_2O[/imath]
x-----------------------------------x
[imath]2Fe + 6H_2SO_4 \to Fe_2(SO_4)_3 + 3SO_2 +6H_2O[/imath]
y--------------------------------------1,5y
[imath]Cu + 2H_2SO_4 \to CuSO_4 + SO_2 + 2H_2O[/imath]
z-------------------------------------z
TN2:
[imath]Mg+H_2SO_4 \to MgSO_4 + H_2[/imath]
x-----------------------x
[imath]Fe+ H_2SO_4 \to FeSO_4 + H_2[/imath]
y-----------------------y
[imath]\begin{cases} 24x + 56y + 64z = 47,2 \\ x+1,5y+z=1,05 \\ 120x+152y=69,6 \end{cases}[/imath]
=>x=0,18, y=0,32, z=0,39
%[imath]m_{Mg}[/imath]=[imath]\frac{0,18.24}{47,2}.100[/imath]=9,15%
b)
[imath]Mg+Cl_2 \to MgCl_2[/imath]
0,18----0,18
[imath]2Fe+3Cl_2 \to 2FeCl_3[/imath]
0,32----0,48
[imath]Cu + Cl_2 \to CuCl_2[/imath]
0,39----0,39
V=(0,18+0,48+0,39).22,4=23,52 lít
c)
[imath]Mg+ 2AgNO_3 \to Mg(NO_3)_2 + 2Ag[/imath]
0,18----------------------------------0,36
[imath]Fe+ 2AgNO_3 \to Fe(NO_3)_2 + 2Ag[/imath]
0,32-------------------0,32---------0,64
[imath]Fe(NO_3)_2 + AgNO_3 \to Fe(NO_3)_3 + Ag[/imath]
0,32-------------------------------------------0,32
[imath]Cu+ 2AgNO_3 \to Cu(NO_3)_2 + 2Ag[/imath]
0,39---------------------------------0,78
[imath]m_{kt}[/imath]=(0,78+0,32+0,64+0,36).108=226,8 g
Bạn tham khảo nhé, chúc bạn học tốt !