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nH2=0,35(mol)
Đặt: nFe2O3= x(mol); nCuO=y(mol) (x,y>0)
PTHH: Fe2O3 + 3 H2 -to-> 2 Fe + 3 H2O
x___________3x_________2x(mol)
CuO + H2 -to-> Cu + H2O
y_____y____y(mol)
Ta có hpt:
\(\left\{{}\begin{matrix}160x+80y=20\\3x+y=0,35\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}x=0,1\\y=0,05\end{matrix}\right.\)
=>mFe2O3= 160.0,1=16(g)
=>%mFe2O3=(16/20).100=80%
=>%mCuO=20%
a. PT : CuO+CO−−>Cu+CO2CuO+CO−−>Cu+CO2
Fe2O3+3CO−−>2Fe+3CO2Fe2O3+3CO−−>2Fe+3CO2
b. gọi a, b lần lượt là số mol CuOvàFe2O3phảnứngCuOvàFe2O3phảnứng
ta có hệ: 80a + 160b=2.08
64a+56*2b=1.464
=>a=....... b=......
=>V=............
Gọi \(n_{Zn}=a\left(mol\right)\rightarrow n_{Fe}=1,6a\left(mol\right)\)
Theo đề bài: \(65a+1,6a.56=7,73\rightarrow a=0,05\left(mol\right)\)
\(\rightarrow\left\{{}\begin{matrix}n_{Zn}=0,05\left(mol\right)\\n_{Fe}=0,05.1,6=0,08\left(mol\right)\end{matrix}\right.\)
PTHH:
Zn + 2HCl ---> ZnCl2 + H2
0,05 0,1 0,05 0,05
Fe + 2HCl ---> FeCl2 + H2
0,08 0,16 0,08 0,08
\(\rightarrow V_{H_2}=\left(0,05+0,08\right).22,4=2,912\left(l\right)\)
Gọi mE = a (g)
=> \(\left\{{}\begin{matrix}m_{Fe_2O_3}=48\%.a=0,48a\left(g\right)\\m_{CuO}=32\%.a=0,32a\left(g\right)\end{matrix}\right.\rightarrow\left\{{}\begin{matrix}n_{Fe_2O_3}=\dfrac{0,48a}{160}=0,003a\left(mol\right)\\n_{CuO}=\dfrac{0,32a}{80}=0,004a\left(mol\right)\end{matrix}\right.\)
PTHH:
Fe2O3 + 3H2 --to--> 2Fe + 3H2O
0,003a->0,009a
CuO + H2 --to--> Cu + H2O
0,004a->0,004a
\(\rightarrow0,13=0,004a+0,009a\\ \Leftrightarrow a=100\left(g\right)\)
Gọi \(\left\{{}\begin{matrix}n_{Fe_3O_4}=a\left(mol\right)\\n_{Fe\left(pư\right)}=b\left(mol\right)\end{matrix}\right.\)
PTHH:
3Fe3O4 + 28HNO3 ---> 3Fe(NO3)3 + NO + 14H2O
a 28a/3 3a a/3
Fe + 4HNO3 ---> Fe(NO3)3 + NO + 2H2O
b 4b b b
Fe + 2Fe(NO3)3 ---> 3Fe(NO3)2
(1,5a + 0,5b)->(3a + b)->(4,5a + 1,5b)
Hệ pt \(\left\{{}\begin{matrix}56\left(b+0,5b+1,5a\right)+232a+1,46=18,5\\\dfrac{a}{3}+b=0,1\end{matrix}\right.\)
\(\Leftrightarrow\left\{{}\begin{matrix}a=0,03\left(mol\right)\\b=0,09\left(mol\right)\end{matrix}\right.\)
\(\rightarrow C_{M\left(HNO_3\right)}=\dfrac{\dfrac{28.0,03}{3}+0,09.4}{0,2}=3,2M\)
=> \(m_{Fe\left(NO_3\right)_2}=\left(4,5.0,03+1,5.0,09\right).180=48,6\left(g\right)\)
Ta có: \(n_{H_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\)
a, PT: \(Fe+2HCl\rightarrow FeCl_2+H_2\)
_____0,05__0,1____________0,05 (mol)
b, mFe = 0,05.56 = 2,8 (g)
c, mHCl = 0,1.36,5 = 3,65 (g)
\(\Rightarrow m_{ddHCl}=\dfrac{3,65}{10\%}=36,5\left(g\right)\)
Bạn tham khảo nhé!
FexOy + yH2 -> xFe + yH2O
nH2=\(\dfrac{8,96}{22,4}=0,4\left(mol\right)\)
nFe=\(\dfrac{16,8}{56}=0,3\left(mol\right)\)
Theo PTHH ta có:
nH2=\(\dfrac{y}{x}\)nFe
0,4=\(\dfrac{y}{x}\).0,3
=>\(\dfrac{y}{x}=\dfrac{0,4}{0,3}=\dfrac{4}{3}\)
Vậy CTHH là Fe3O4
a, Gọi \(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{Al}=b\left(mol\right)\end{matrix}\right.\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
PTHH:
Fe + 2HCl ---> FeCl2 + H2
a--->2a------------------>a
2Al + 6HCl ---> 2AlCl3 + 3H2
b---->3b-------------------->1,5b
=> \(\left\{{}\begin{matrix}56a+27b=16,6\\a+1,5b=0,5\end{matrix}\right.\Leftrightarrow a=b=0,2\left(mol\right)\)
=> \(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=0,2.27=5,4\left(g\right)\end{matrix}\right.\)
b) \(C\%_{HCl}=\dfrac{\left(0,2.2+0,2.3\right).36,5}{300}.100\%=12,167\%\)
\(n_{H_2}=\dfrac{11,2}{22,4}=0,5\left(mol\right)\)
gọi nFe : a , nAl: b (a,b>0) => 56a + 27b = 16,6 (g)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\uparrow\)
a a
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)
b \(\dfrac{3b}{2}\)
=> \(a+\dfrac{3b}{2}=0,5\)
ta có hệ pt
\(\left\{{}\begin{matrix}56a+27b=16,6\\a+\dfrac{3b}{2}=0,5\end{matrix}\right.\)
=> a= 0,2 , b = 0,2
\(\left\{{}\begin{matrix}m_{Fe}=0,2.56=11,2\left(g\right)\\m_{Al}=16,6-11,2=5,4\left(g\right)\end{matrix}\right.\)
\(pthh:Fe+2HCl\rightarrow FeCl_2+H_2\)
0,2 0,4
\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)
0,2 0,6
=> \(m_{HCl}=\left(0,4+0,6\right).36,5=36,5\left(g\right)\)
=> \(C\%=\dfrac{36,5}{200}.100\%=18,25\%\)
nO2 = \(\dfrac{5,6}{22,4}=0,25\left(mol\right)\)
Pt: 2Cu + O2 \(\rightarrow\) 2CuO
x 0,5x x
3Fe + 2O2 \(\rightarrow\) Fe3O4
y 2/3y 1/3y
Theo bài ta có hpt:
\(\left\{{}\begin{matrix}64x+56y=23,2\\0,5x+\dfrac{2}{3}y=0,25\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}x=0,1\\y=0,3\end{matrix}\right.\)
mCuO = 0,1.80 = 8 g
mFe3O4 = 0,3.232 = 69,6g
=> %mCuO = \(\dfrac{8}{8+69,6}.100\%=10,3\%\)
%mFe3O4 = 100 - 10,3 = 89,7%
a) nH2= 0,4(mol) ; nFe=0,3(mol)
PTHH: FexOy + y H2 -to-> x Fe + y H2O
Ta có: x:y= nFe:nH2= 0,3:0,4=3:4
=> CTHH oxit sắt : Fe3O4
PTHH: Fe3O4 + 4 H2 -to-> 3 Fe + 4 H2O