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\(a)2Al+6HCl\rightarrow2AlCl_3+3H_2\\ Fe+2HCl\rightarrow FeCl_2+H_2\\ b)n_{H_2}=\dfrac{5,6}{22,4}=0,25mol\\ n_{Al}=a;n_{Fe}=b\\ \left\{{}\begin{matrix}3a+b=0,25\\27a+56b=8,3\end{matrix}\right.\\ a=\dfrac{19}{470};b=\dfrac{121}{940}\\ \%m_{Al}=\dfrac{\dfrac{19}{470}\cdot27}{8,3}\cdot100=13,15\%\\ \%m_{Fe}=100-13,15=86,85\%\\ c)n_{HCl}=3\cdot\dfrac{19}{470}+2\cdot\dfrac{121}{940}=\dfrac{89}{235}mol\\ m_{ddHCl=}=\dfrac{\dfrac{89}{235}\cdot36,5}{7,3}\cdot100=189g\\ d)n_{AlCl_3}=n_{Al}=\dfrac{19}{470}mol\\ n_{Fe}=n_{FeCl_2}=\dfrac{121}{940}mol\)
\(m_{dd}=8,3+189-0,25.2=196,8g\\ C_{\%AlCl_3}=\dfrac{\dfrac{19}{470}\cdot133,8}{196,8}\cdot100=2,8\%\\ C_{\%FeCl_2}=\dfrac{\dfrac{121}{940}127}{196,8}\cdot100=8,3\%\)
2Al +3H2SO4---->Al2(SO4)3 +3H2(1)
Fe +H2SO4 ---->Fe2(SO4) +H2(2)
a) Gọi n\(_{Al}=x\Rightarrow m_{Al}=27x\)
n\(_{Fe}=y\Rightarrow m_{Fe}=56y\)
=> 27x+56y=11(*)
Mặt khác:
n\(_{H2}=\frac{8,96}{22,4}=0,1\left(mol\right)\)
Theo pthh1
n\(_{H2}=\)\(\frac{3}{2}n_{Al}=1,5x\left(mol\right)\)
Theo PTHH2
n\(_{H2}=n_{Fe}=y\left(mol\right)\)
=> 1,5x+y=0,4(**)
Từ (*)và(**) ta có hệ pt
\(\left\{{}\begin{matrix}27x+56y=11\\1,5x+y=0,4\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,2\\y=0,1\end{matrix}\right.\)
%m\(_{Al}=\frac{0,2.27}{11}.100\%=24,54\%\)
%m\(_{Fe}=100\%-24,54\%=75,46\%\)
b)ddX gồm H2SO4 dư , FeSO4, Al2(SO4)3
Theo pthh(1)(2)
n\(_{H2SO4}=n_{_{ }H2}=0,4\left(mol\right)\)
m dd(H2SO4)=\(\frac{0,4.98.100}{19,8}=197,98\%\)
C%(H2SO4)=\(\frac{0,4.98}{197,98}.100\%=19,8\%\)
Còn lại bạn tự tính nhé
PTHH: \(Fe+H_2SO_4\rightarrow FeSO_4+H_2\uparrow\)
a) Ta có: \(n_{H_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)=n_{Fe}\)
\(\Rightarrow m_{Fe}=0,25\cdot56=14\left(g\right)\) \(\Rightarrow m_{Cu}=6\left(g\right)\)
b) Theo PTHH: \(n_{FeSO_4}=0,25mol\) \(\Rightarrow m_{FeSO_4}=0,25\cdot152=38\left(g\right)\)
Mặt khác: \(\left\{{}\begin{matrix}m_{ddH_2SO_4}=\dfrac{0,25\cdot98}{10\%}=245\left(g\right)\\m_{H_2}=0,25\cdot2=0,5\left(g\right)\end{matrix}\right.\)
\(\Rightarrow m_{dd}=m_{hh}+m_{H_2SO_4}-m_{Cu}-m_{H_2}=258,5\left(g\right)\)
\(\Rightarrow C\%_{FeSO_4}=\dfrac{38}{258,5}\cdot100\%\approx14,7\%\)
pthh : Fe +H2SO4 → FeSO4 +H2
theo bài ra số mol của h2 =0,15 (mol)
theo pt : nFe=nH2=0,15 (mol)
mFe=0,15 .56 =8,4 (g) ⇒mCu=20-8,4=11,6 (g)
thôi thì mình làm cho bn vậy, câu a ko làm dc đâu, làm câu b thôi, làm sao biết dc chất nào dư khi chỉ có số mol 1 chất?
nK2SO3=0.1367(mol)
mddH2SO4=Vdd.D=200.1,04=208(g)
K2SO3+H2SO4-->K2SO4+H2O+SO2
0.1367----0.1367----0.1367---------0.1367 (mol)
mddspu=100+208-0,1367.64=299.2512(g) ; mK2SO4=0,1367.174=23.7858(g)
==>C%=23.7858.100/299.512=7.94%
2)pt bn tự ghi nhé
ta có hệ pt: 56a+27b=11 và a+3b/2=8.96/22.4==>a=0.1, b=0.2
==>%Fe=0.1x56x100/11=50.9%
%Al=100%-50.9%=49.1%
b)nH2SO4= 0.7(mol)==>VddH2SO4=0.7/2=0.35(L)
Bài 1 :
\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(Fe+2HCl\rightarrow FeCl_2+H_2\)
\(0.1..................................0.1\)
\(m_{hh}=x=0.1\cdot56+4.4=10\left(g\right)\)
Bài 2 :
\(n_{H_2}=\dfrac{2.24}{22.4}=0.1\left(mol\right)\)
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
\(0.1.......0.1..........0.1.............0.1\)
\(m_{Fe_2O_3}=7.2-0.1\cdot56=1.6\)
\(n_{Fe_2O_3}=\dfrac{7.2-0.1\cdot56}{160}=0.01\left(mol\right)\)
\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)
\(0.01...........0.03..............0.01\)
\(c.\)
\(V_{dd_{H_2SO_4}}=\dfrac{0.1+0.03}{1}=0.13\left(l\right)\)
\(d.\)
\(C_{M_{FeSO_4}}=\dfrac{0.1}{0.13}=\dfrac{10}{13}\left(M\right)\)
\(C_{M_{Fe_2\left(SO_4\right)_3}}=\dfrac{0.03}{0.13}=\dfrac{3}{13}\left(M\right)\)
Theo bài ra, ta có: \(m_{Ag}=5,6\left(g\right)\)
PTHH: \(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\uparrow\)
a) Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\) \(\Rightarrow n_{Al}=\dfrac{1}{15}\left(mol\right)\) \(\Rightarrow m_{Al}=\dfrac{1}{15}\cdot27=1,8\left(g\right)\)
\(\Rightarrow\%m_{Al}=\dfrac{1,8}{1,8+5,6}\cdot100\%\approx24,32\%\) \(\Rightarrow\%m_{Ag}=75,68\%\)
b) Theo PTHH: \(n_{H_2SO_4}=n_{H_2}=0,1mol\) \(\Rightarrow C_{M_{H_2SO_4}}=\dfrac{0,1}{0,1}=1\left(M\right)\)
c) PTHH: \(H_2SO_4+Ba\left(OH\right)_2\rightarrow BaSO_4\downarrow+2H_2O\)
Theo PTHH: \(n_{Ba\left(OH\right)_2}=n_{H_2SO_4}=0,1mol\)
\(\Rightarrow V_{ddBa\left(OH\right)_2}=\dfrac{0,1}{0,2}=0,5\left(l\right)=500\left(ml\right)\)