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\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
a_____a_________________ a
\(Zn+H_2SO_4\rightarrow ZnSO_4+H_2\)
b_____ b ___________________b
Giải hệ PT:
\(\left\{{}\begin{matrix}56a+65b=12,1\\a+b=\frac{4,48}{22,4}=0,2\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=0,1\left(mol\right)\\b=0,1\left(mol\right)\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}\%m_{Fe}=\frac{0,1.56}{12,1}.100\%=46,28\%\\\%m_{Zn}=100\%-46,28\%=53,72\%\end{matrix}\right.\)
\(\Rightarrow V_{H2SO4\left(can.dung\right)}=\frac{0,1+0,1}{0,2}=0,1\left(l\right)\)
\(\Rightarrow\left\{{}\begin{matrix}CM_{FeSO4}=\frac{0,1}{0,1}=1M\\CM_{ZnSO4}=\frac{0,1}{0,1}=1M\end{matrix}\right.\)
Ta có:
\(n_{SO2}=\frac{2,668}{22,4}=0,12\left(mol\right)\)
Gọi \(\left\{{}\begin{matrix}n_{Zn}:x\left(mol\right)\\n_{ZnO}:y\left(mol\right)\end{matrix}\right.\)
\(Zn+2H_2SO_4\rightarrow ZnSO_4+SO_2+2H_2O\)
x_____2x__________________x______
\(ZnO+H_2SO_4\rightarrow ZnSO_4+H_2O\)
y_______y____________________
\(\Rightarrow x=0,12\left(mol\right)\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Zn}=0,12.65=7,8\left(g\right)\\m_{ZnO}=27,24-7,8=19,44\left(g\right)\end{matrix}\right.\)
\(n_{ZnO}=\frac{19,44}{81}=0,24\left(mol\right)\)
\(n_{H2SO4}=0,48\left(mol\right)\)
\(\Rightarrow m_{H2SO4}=0,48.96=46,08\left(g\right);m_{dd\left(H2SO4\right)}=\frac{46,08}{80\%}=57,6\left(g\right)\)
Bạn ghi cũng được nhưng mình không dùng đến FeO nên mk không ghi !
Đặt:
nFeCO3= x mol
nFe= y mol
mhh= 116x + 56y= 17.2g (1)
FeCO3 + H2SO4 --> FeSO4 + CO2 + H2O
x__________x______________x
Fe + H2SO4 --> FeSO4 + H2
y_____y_______________y
n khí= nCO2 + nH2= 4.48/22.4=0.2 mol
<=> x + y= 0.2 (2)
Giải (1) và (2) có:
x=y=0.1
mFeCO3= 0.1*116=11.6g
mFe=0.1*56=5.6g
nH2SO4= 0.1+0.1=0.2 mol
VddH2SO4= 0.2/1=0.2l
2FeCO3 + 4H2SO4 --> Fe2(SO4)3 + SO2 + 2CO2 + 4H2O
0.1____________________________0.05
2Fe + 6H2SO4 --> Fe2(SO4)3 + 3SO2 + 6H2O
0.1_________________________0.15
nSO2= 0.15+0.05=0.2 mol
VSO2= 0.2*22.4=4.48l
a, Gọi \(\left\{{}\begin{matrix}n_{Mg}:a\left(mol\right)\\n_{Al}:b\left(mol\right)\end{matrix}\right.\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
a______a______a___________a
\(2Al+3H_2SO_4\rightarrow Al_2\left(SO_4\right)_3+3H_2\)
b_____3/2b_______b/2_________3/2b
\(n_{H2}=\frac{8,96}{22,4}=0,4\left(mol\right)=a+\frac{3}{2}b\)
\(m_{hh}=m_{Mg}+m_{Al}\Leftrightarrow m_{hh}=n_{Mg}.M_{Mg}+n_{Al}.M_{Al}\)
\(\Leftrightarrow7,8=24a+27b\)
Giải hệ PT :
\(\left\{{}\begin{matrix}a+\frac{3}{2}b=0,4\\24a+27b=7,8\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}a=0,1\\b=0,2\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0,1.24=2,4\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)
b, \(n_{H2SO4}=a+\frac{3}{2}b=0,1+\frac{3}{2}.0,2=0,4\left(mol\right)\)
\(\Rightarrow n_{H2SO4\left(pu\right)}=0,4-0,4.10\%=0,36\left(mol\right)\)
\(\Rightarrow V_{H2SO4\left(Cd\right)}=\frac{0,36}{2}=0,18\left(l\right)\)
Gọi \(\left\{{}\begin{matrix}n_{Mg}:x\left(mol\right)\\n_{Fe}:y\left(mol\right)\end{matrix}\right.\)
Ta có:
\(n_{H2}=\frac{10,08}{22,4}=0,45\left(mol\right)\)
\(Mg+H_2SO_4\rightarrow MgSO_4+H_2\)
x___________________y_______
\(Fe+H_2SO_4\rightarrow FeSO_4+H_2\)
y_________________y________
Giải hệ PT:
\(\left\{{}\begin{matrix}24x+56y=20,4\\x+y=0,45\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=0,15\\y=0,3\end{matrix}\right.\)
\(\Rightarrow\left\{{}\begin{matrix}m_{Mg}=0,15.24=3,6\left(g\right)\\m_{Fe}=0,3.56=16,8\left(g\right)\end{matrix}\right.\)
PTHH:
\(Mg+2H_2SO_4\rightarrow MgSO_4+SO_2+2H_2O\)
0,15_________________0,15_______
\(2Fe+6H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3SO_2+6H_2O\)
0,3_______________0,45_______________
\(n_{SO2}=0,6\left(mol\right)\Rightarrow V_{SO2}=0,6.22,4=13,44\left(l\right)\)
Ta có nH2 = 0,8,9622,4\" id=\"MathJax-Element-1-Frame\">896\\22,4= 0,04 ( mol )
\n\n2Al + 3H2SO4 →\" id=\"MathJax-Element-2-Frame\">→→ Al2(SO4)3 + 3H2
\n\nx............1,5x............x...................1,5x
\n\nFe + H2SO4 →\" id=\"MathJax-Element-3-Frame\">→→ FeSO4 + H2
\n\ny.........y.............y.................y
\n\n=> {27x+56y=111,5x+y=0,4\" id=\"MathJax-Element-4-Frame\">{27x+56y=1,1
\n\n{27x+56y=111,5x+y=0,4\">.......1,5x+y=0,04
\n\n=> {x=0,2y=0,1\" id=\"MathJax-Element-5-Frame\">{x=0,02y=0,01
\n\n=> mAl = 0,02 . 27 = 0,54 ( gam )
\n\n=> %mAl =0, 5,411×100≈49,1%\" id=\"MathJax-Element-6-Frame\">54\\1,1×100≈49,1%
\n\n=> %mFe = 100 - 49,1 = 50,9 ( %)
\n\n=> nH2SO4 = 1,5 . 0,02 + 0,01 = 0,04 ( mol )
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