\(^mHCl=182,5.20\%=36,5\left(g\right)\rightarrow^nHCl=\frac{36,5}{36,5}=1\left(mol\right)\)
Gọi nAl2O3 = x (mol); nFe = y (mol)
PTHH:
\(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\left(1\right)\)
\(Fe+2HCl\rightarrow FeCl2+H2\left(2\right)\)
Theo (1): nHCl = 6.nAl2O3 = 6x (mol)
Theo (2): nHCl = 2.nFe = 2y (mol)
Ta có: \(\left\{{}\begin{matrix}6x+2y=1\\102x+56y=21,4\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)
\(\rightarrow\left\{{}\begin{matrix}^mAl_2O_3=0,1.102=10,2\left(g\right)\\^mFe=0,2.56=11,2\left(g\right)\end{matrix}\right.\)
-> %m Al2O3, %mFe
Gọi x, y lần lượt là số mol của Al2O3 và Fe
=> mHCl = 36,5(g)
=> n HCl= 1(mol)
PTHH : Al2O3+6HCl--->2AlCl3+3H2O
=>nHCl= 6 => 6x
Fe+2HCl--->FeCL2+H2
=>nHCl=2y
\(\Rightarrow\left\{{}\begin{matrix}6x+2y=1\\102x+56y=21,4\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)
Còn lại tự tính nha
Tham khảo :
mHCl=182,5.20%=36,5(g)→nHCl=36,536,5=1(mol)
Gọi nAl2O3 = x (mol); nFe = y (mol)
PTHH:
Al2O3+6HCl→2AlCl3+3H2O(1)
Fe+2HCl→FeCl2+H2(2)
Theo (1): nHCl = 6.nAl2O3 = 6x (mol)
Theo (2): nHCl = 2.nFe = 2y (mol)
Ta có: {6x+2y=1102x+56y=21,4
→{x=0,1y=0,2
→{mAl2O3=0,1.102=10,2(g)mFe=0,2.56=11,2(g)
-> %m Al2O3, %mFe
Al2O3 +6HCl----.2AlCl3 +3H2O(1)
x-----------6x
Fe +2HCl---.--->FeCl2 +H2
y---------2y
Ta có
m\(_{HCl}=\frac{182,5.20}{100}=36,5\left(g\right)\)
n\(_{HCl}=1\left(mol\right)\)
Theo bài ra ta có pt
\(\left\{{}\begin{matrix}102x+56y=21,4\\6x+2y=1\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,1\\y=0,2\end{matrix}\right.\)
%m\(_{Al2O3}=\frac{0,1.102}{21,4}.100\%=47,66\%\)
%m\(_{Fe}=100-47,66=52,34\left(g\right)\)
b) Tự làm nhé