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a) nAl2O3= 10,2/102= 0,1(mol)
nFe2O3= 8/160=0,05(mol)
b) nCO2= 3,36/22,4= 0,15(mol)
nCO = 4,48/22,4= 0,2(mol)
c) nAl2(SO4)3= 3,42/342= 0,01(mol)
nFe2(SO4)3= 8/400=0,02(mol)
d) nNO2= 2,24/22,4=0,1(mol)
nCO=11,2/22,4=0,5(mol)
e) nCO2= 5,6/22,4= 0,25(mol)
nCO= 4,48/22,4 = 0,2(mol)
nH2= 1,12/22,4=0,05(mol)
a) nAl2O3= 10,2/102= 0,1(mol)
nFe2O3= 8/160=0,05(mol)
b) nCO2= 3,36/22,4= 0,15(mol)
nCO = 4,48/22,4= 0,2(mol)
c) nAl2(SO4)3= 3,42/342= 0,01(mol)
nFe2(SO4)3= 8/400=0,02(mol)
d) nNO2= 2,24/22,4=0,1(mol)
nCO=11,2/22,4=0,5(mol)
e) nCO2= 5,6/22,4= 0,25(mol)
nCO= 4,48/22,4 = 0,2(mol)
nH2= 1,12/22,4=0,05(mol)
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%
Giả sử thêm V lít O2 vào 20 lít hỗn hợp ban đầu
Bảo toàn khối lượng ta có :
\(\dfrac{20}{22,4}.24.2=\dfrac{20+V}{22,4}.22,4.2-\dfrac{V}{22,4}.32\)
=> V=5(lít)
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
=> \(m_{HCl}=\left(0,4+0,6\right).36,5=36,5\left(g\right)\)
=> \(C\%=\dfrac{36,5}{200}.100\%=18,25\%\)
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%
\(n_{H_2}=\dfrac{0,56}{22,4}=0,025\left(mol\right)\)
\(PTHH:Ba+2H_2O\rightarrow Ba\left(OH\right)_2+H_2\uparrow\)
0,025 0,025
\(BaO+H_2O\rightarrow Ba\left(OH\right)_2\)
\(\rightarrow m_{Ba}=0,025.137=3,425\left(g\right)\\ \rightarrow\left\{{}\begin{matrix}\%m_{Ba}=\dfrac{3,425}{6,486}=52,81\%\\\%m_{BaO}=100\%-52,81\%=47,19\%\end{matrix}\right.\)
\(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)
PTHH: Ba + 2H2O --> Ba(OH)2 + H2
0,1<------------------------0,1
=> mBa = 0,1.137 = 13,7 (g)
=> mCu = 20 - 13,7 = 6,3 (g)
\(\left\{{}\begin{matrix}\%m_{Ba}=\dfrac{13,7}{20}.100\%=68,5\%\\\%m_{Cu}=\dfrac{6,3}{20}.100\%=31,5\%\end{matrix}\right.\)
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
a) n Al2O3=10,2/102=0,1(mol)
n Fe=8/160=0,05(mol)
n hh=0,15(mol)
b) n C02=3,36/22,4=0,15(MOL)
n CO=4,48/22,4=0,2(mol)
n hh=0,35(mol)
c) n Al2(SO4)3=3,42/342=0,01(mol)
n Fe2(SO4)3=8/400=0,02(mol)
n hh=0,03(mol)
d) n NO2=2,24/22,4=0,01(mol)
n CO=11,2/22,4=0,5(mol)
m hh=0,51(mol)
e) n CO2=5,6/22,4=0,25(mol)
n CO=4,48/22,4=0,2(Mol)
n H2=1,12/22,4=0,05(mol)
n hh=0,5(mol)
Fan SNSD bạn cứ tính số mol của từng chất rồi cộng số mol các chất lại là ra số mol hỗn hợp r đó..