PT: Fe2O3+3H2to→2Fe+3H2O

CuO+H2to→Cu+H2O

a, Ta có:  mFe2O3=20.60%=12(g)

⇒nFe2O3=\(\dfrac{12}{160}\)=0,075(mol

mCuO=20−12=8(g

⇒nCuO=\(\dfrac{8}{80}\)=0,1(mol)

Theo pT: 

nFe=2nFe2O3=0,15(mol)

nCu=nCuO=0,1(mol)

⇒mFe=0,15.56=8,4(g)

mCu=0,1.64=6,4(g)

b, Theo PT: nH2=3nFe2O3+nCuO=0,325(mol)

⇒VH2=0,325.22,4=7,28(l)

c. Zn+2HCl->ZnCl2+H2

               0,65----------0,325

=>m HCl=0,65.36,5=23,725g

Ủa bạn cái câu a . 20x60% ( 20 ở đâu vậy bạn

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\\ CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\\ Đặt:n_{Fe}=a\left(mol\right);n_{Cu}=0,5a\left(mol\right)\\ m_{hhB}=17,6\\ \Leftrightarrow56a+64.0,5a=17,6\\ \Leftrightarrow a=0,2\left(mol\right)\\ \Rightarrow n_{Fe}=0,2\left(mol\right);n_{Cu}=0,1\left(mol\right)\\ a,n_{H_2}=\dfrac{3}{2}.n_{Fe}+n_{Cu}=\dfrac{3}{2}.0,2+0,1=0,4\left(mol\right)\\ \Rightarrow V_{H_2\left(đktc\right)}=0,4.22,4=8,96\left(l\right)\\ b,Fe+2HCl\rightarrow FeCl_2+H_2\\ n_{HCl}=\dfrac{18,25}{36,5}=0,5\left(mol\right)\\ Vì:\dfrac{0,2}{1}< \dfrac{0,5}{2}\Rightarrow HCldư\\ \Rightarrow ddC:FeCl_2,HCldư\\ n_{FeCl_2}=n_{Fe}=0,2\left(mol\right)\Rightarrow m_{FeCl_2}=0,2.127=25,4\left(g\right)\\ n_{HCl\left(dư\right)}=0,5-0,2.2=0,1\left(mol\right)\)

\(\Rightarrow m_{HCl\left(dư\right)}=0,1.36,5=3,65\left(g\right)\)

\(m_{CuO}=50.20\%=10\left(g\right)\)

\(n_{CuO}=\dfrac{10}{80}=0,125\left(mol\right)\)

\(m_{Fe_2O_3}=50-10=40\left(g\right)\)

\(n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)

PTHH :

  \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

0,125   0,125   0,125 

\(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

0,25        0,75    0,5 

\(a,V_{H_2}=\left(0,75+0,125\right).22,4=19,6\left(l\right)\)

\(b,m_{Cu}=0,125.64=8\left(g\right)\)

\(m_{Fe}=0,5.56=28\left(g\right)\)

\(Tacó:m_{Fe_2O_3}:m_{CuO}=3:2\\ m_{Fe_2O_3}+m_{CuO}=40\\ \Rightarrow m_{Fe_2O_3}=24\left(g\right)\Rightarrow n_{Fe_2O_3}=0,15\left(mol\right)\\ \Rightarrow m_{CuO}=16\left(g\right)\Rightarrow n_{CuO}=0,2\left(mol\right)\\ Fe_2O_3+3H_2-^{t^o}\rightarrow2Fe+3H_2O\left(1\right)\\ CuO+H_2O-^{t^o}\rightarrow Cu+H_2O\left(2\right)\\TheoPT\left(1\right): n_{Fe}=2n_{Fe_2O_3}=0,3\left(mol\right)\\ \Rightarrow m_{Fe}=16,8\left(g\right)\\TheoPT\left(2\right): n_{Cu}=n_{CuO}=0,2\left(mol\right)\\ \Rightarrow m_{Cu}=0,2.64=12,8\left(g\right)\)

PT: \(Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

\(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

a, Ta có: \(\left\{{}\begin{matrix}m_{Fe_2O_3}=20.60\%=12\left(g\right)\Rightarrow n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\\m_{CuO}=20-12=8\left(g\right)\Rightarrow n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\end{matrix}\right.\)

Theo pT: \(\left\{{}\begin{matrix}n_{Fe}=2n_{Fe_2O_3}=0,15\left(mol\right)\\n_{Cu}=n_{CuO}=0,1\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right)\)

\(m_{Cu}=0,1.64=6,4\left(g\right)\)

b, Theo PT: \(n_{H_2}=3n_{Fe_2O_3}+n_{CuO}=0,325\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,325.22,4=7,28\left(l\right)\)

Bạn tham khảo nhé!

\(n_{Fe}=\dfrac{2,8}{56}=0,05mol\)

\(\Rightarrow m_{Cu}=6-2,8=3,2g\)\(\Rightarrow n_{Cu}=0,05mol\)

\(CuO+H_2\rightarrow Cu+H_2O\) 

            0,05     0,05

\(Fe_2O_3+3H_2\rightarrow2Fe+3H_2O\)

               0,075    0,05

\(\Rightarrow\Sigma n_{H_2}=0,075+0,05=0,125mol\)

\(\Rightarrow V=0,125\cdot22,4=2,8l\)

hư

gọi n cuo = a (mol)

n fe2o3 = b (mol)

PTHH     Cuo + h2 ---> cu + h2o

mol           a          a         a

PTHH    Fe2O3 + 3H2 ----> 2Fe + 3H2O

mol         b               3b            2b

Ta có 64a + 112b = 12 (1)

nh2 (đktc) = 2,24 : 22,4 = 0,1 (mol)

PTHH : Fe + 2HCl ----> FeCl2 + H2

mol        2b                                  2b

=> 2b = 0,1 (mol) (2)

Từ (1) và (2) => a = 0,1 (mol) và b = 0,2 (mol)

m hỗn hợp oxit = 0,1 . 80 + 0,2 . 160 = 8 + 32 = 40 (g)

%CuO = 8 . 100 : 40 = 20%

%Fe2O3 = 100 - 20 = 80 %

b) Vh2 (đktc) = (0,1 + 3.0,2) . 22,4 = 15,68 (g)