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29 tháng 11 2023

\(a.Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\\ CuO+H_2SO_4\rightarrow CuSO_4+H_2O\\ b.n_{H_2SO_4}=0,22.1,25=0,275mol\\ n_{Fe_2O_3}=a;n_{CuO}=b\\ \Rightarrow\left\{{}\begin{matrix}3a+b=0,275\\160a+80b=16\end{matrix}\right.\\ \Rightarrow a=0,075;b=0,05\\ \%m_{Fe_2O_3}=\dfrac{0,075.160}{16}\cdot100=75\%\\ \%m_{CuO}=100-75=25\%\)

1 tháng 4 2021

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18 tháng 8 2023

a, PT: \(CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(Fe_2O_3+6HCl\rightarrow2FeCl_3+3H_2O\)

Gọi: \(\left\{{}\begin{matrix}n_{CuO}=x\left(mol\right)\\n_{Fe_2O_3}=y\left(mol\right)\end{matrix}\right.\) ⇒ 80x + 160y = 11,2 (1)

Ta có: \(m_{HCl}=146.10\%=14,6\left(g\right)\Rightarrow n_{HCl}=\dfrac{14,6}{36,5}=0,4\left(mol\right)\)

Theo PT: \(n_{HCl}=2n_{CuO}+6n_{Fe_2O_3}=2x+6y=0,4\left(2\right)\)

Từ (1) và (2) \(\Rightarrow\left\{{}\begin{matrix}x=0,02\left(mol\right)\\y=0,06\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{CuO}=\dfrac{0,02.80}{11,2}.100\%\approx14,29\%\\\%m_{Fe_2O_3}\approx85,71\%\end{matrix}\right.\)

b, PT: \(CuO+H_2SO_4\rightarrow CuSO_4+H_2O\)

\(Fe_2O_3+3H_2SO_4\rightarrow Fe_2\left(SO_4\right)_3+3H_2O\)

Theo PT: \(n_{H_2SO_4}=n_{CuO}+3n_{Fe_2O_3}=0,2\left(mol\right)\)

\(\Rightarrow m_{H_2SO_4}=0,2.98=19,6\left(g\right)\Rightarrow m_{ddH_2SO_4}=\dfrac{19,6}{4,9\%}=400\left(g\right)\)

18 tháng 11 2016

CuO +2HCl= CuCl2 +H2O
ZnO+2HCl= ZnCl2 +H2O
gọi x,y là mol của CuO, ZnO
80x + 81y = 12.1
2x+2y = 0.3
=> x=0.05 , y=0.1 => mCuO= 4 %CuO=4/12.1 m ZnO=8.1 =>%ZnO=8.1/12.1
nH2SO4=1/2nHCl=0.3/2 =0.15
mH2SO4=0.15x98=14.7g => mddH2SO4=14.7/20%=73.5g

PTHH: \(MgO+2HCl\rightarrow MgCl_2+H_2O\)

                  a_____2a_______a_______a     (mol)

           \(Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)

                  b_____6b_______2b_______3b   (mol)

Ta lập HPT: \(\left\{{}\begin{matrix}40a+102b=18,2\\2a+6b=\dfrac{182,5\cdot20\%}{36,5}=1\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}a=0,2\\b=0,1\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}\%m_{MgO}=\dfrac{0,2\cdot40}{18,2}\cdot100\%\approx43,96\%\\\%m_{Al_2O_3}=56,04\%\end{matrix}\right.\)

Theo PTHH: \(n_{MgCl_2}=0,2\left(mol\right)=n_{AlCl_3}\) \(\Rightarrow\left\{{}\begin{matrix}m_{MgCl_2}=0,2\cdot95=19\left(g\right)\\m_{AlCl_3}=0,2\cdot133,5=26,7\left(g\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}C\%_{MgCl_2}=\dfrac{19}{18,2+182,5}\cdot100\%\approx9,47\%\\C\%_{AlCl_3}=\dfrac{26,7}{182,5+18,2}\cdot100\%\approx13,3\%\end{matrix}\right.\)

 

a) mHCl=182,5. 20%=36,5(g) -> nHCl=1(mol)

Đặt nMgO=a(mol); nAl2O3=b(mol)

PTHH: MgO +2 HCl -> MgCl2 + H2O

a__________2a______a(mol)

Al2O3 + 6 HCl ->  2 AlCl3 + 3 H2O

b_______6b______2b(mol)

b) Ta có hpt:

\(\left\{{}\begin{matrix}40a+102b=18,2\\2a+6b=1\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,2\\b=0,1\end{matrix}\right.\)

=> mMgO=0,2.40=8(g)

=>%mMgO=(8/18,2).100=43,956%

=> %mAl2O3= 56,044%

c) m(muối)= mAlCl3 + mMgCl2= 133,5.2b+ 95.a= 133,5.0,1.2+95.0,2= 45,7(g)

d) mAlCl3= 26,7(g) ; mMgCl2 = 19(g)

mddsau= 18,2+ 182,5= 200,7(g)

=>C%ddAlCl3=(26,7/200,7).100=13,303%

C%ddMgCl2=(19/200,7).100=9,467%

22 tháng 12 2022

Fe+2HCl->FeCl2+H2

0,2---------------------0,2

FeO+2HCl->FeCl2+H2O

H2=0,2 mol

=>%mFe=\(\dfrac{0,2.56}{20}.100=56\%\)

=>%mFeO=44%

22 tháng 12 2022

chê xN :))

Gọi \(\left\{{}\begin{matrix}n_{Al}=x\left(mol\right)\\n_{Fe}=y\left(mol\right)\end{matrix}\right.\)

\(n_{H_2}=\dfrac{4,48}{22,4}=0,2mol\)

\(2Al+6HCl\rightarrow2AlCl_3+3H_2\)

\(Fe+2HCl\rightarrow FeCl_2+H_2\)

Theo pt: \(\Rightarrow\left\{{}\begin{matrix}3x+y=0,2\\27x+56y=5,5\end{matrix}\right.\Rightarrow\left\{{}\begin{matrix}x=\dfrac{19}{470}\\y=\dfrac{37}{470}\end{matrix}\right.\)

\(\%m_{Al}=\dfrac{\dfrac{19}{470}\cdot27}{5,5}\cdot100\%=19,84\%\)

\(\%m_{Fe}=100\%-19,84\%=80,16\%\)

6 tháng 3 2022

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29 tháng 12 2022

a)

$Fe + 2HCl \to FeCl_2 + H_2$
$FeO +2 HCl \to FeCl_2 + H_2O$

b)

Theo PTHH : 

$n_{Fe} = n_{H_2} = \dfrac{4,48}{22,4} = 0,2(mol)$

$\%m_{Fe} = \dfrac{0,2.56}{20}.100\% = 56\%$

$\%m_{FeO} = 100\% - 56\% = 44\%$

c) $n_{FeO} = \dfrac{11}{90}(mol)$
$n_{HCl} = 2n_{Fe} + 2n_{FeO} = \dfrac{29}{45}(mol)$

$m_{dd\ HCl} = \dfrac{ \dfrac{29}{45}.36,5}{7,3\%} = 322,22(gam)$