\(m_{Fe_2O_3}=16\cdot75\%=12\left(g\right)\)

\(n_{Fe_2O_3}=\dfrac{12}{160}=0.075\left(mol\right)\)

\(n_{CuO}=16\cdot25\%=4\left(g\right)\)

\(n_{CuO}=\dfrac{4}{80}=0.05\left(mol\right)\)

\(Fe_2O_3+3H_2\underrightarrow{^{^{t^0}}}2Fe+3H_2O\)

\(CuO+H_2\underrightarrow{^{^{t^0}}}Cu+H_2O\)

\(n_{H_2}=3\cdot0.075+0.05=0.275\left(mol\right)\)

a,\(m_{Fe_2O_3}=16.75\%=12\left(g\right)\Rightarrow n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)

   \(m_{CuO}=16-12=4\left(g\right)\Rightarrow n_{CuO}=\dfrac{4}{80}=0,05\left(mol\right)\)

PTHH: Fe₂O₃ + 3H₂ → 2Fe + 3H₂O

Mol:     0,075    0,225    0,15

PTHH: CuO + H₂ → Cu + H₂O

Mol:     0,05   0,05   0,05

\(\Rightarrow m_{Fe}=0,15.56=8,4\left(g\right);m_{Cu}=0,05.64=3,2\left(g\right)\)

b,\(n_{H_2}=0,225+0,05=0,275\left(mol\right)\)

hỗn hợp 100% <=> 20g 
1. fe2o3 60% <=> 12g <=> 0,075mol 
cuo 40% <=> 8g <=> 0,1 mol 
Ta có: 
Fe2O3 + 3H2 --> 2Fe + 3H2O 
mol: 0,075 0,225 0,15 
CuO + H2 → Cu + H20 
mol: 0.1 0.1 0.1 
mFe= 0,15x56=8,4g. mCu=0,1x64= 6,4g 
nH2= 0,225+0,1=0,325mol ==> V H2 = 0,325x 22,4 = 7,28 lít 

\(a) n_{Fe_2O_3} = \dfrac{16.75\%}{160} = 0,075(mol)\\ n_{CuO} = \dfrac{16.25\%}{80} = 0,05(mol)\\ Fe_2O_3 + 3H_2 \xrightarrow{t^o} 2Fe + 3H_2O\\ CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ n_{Fe} = 2n_{Fe_2O_3} = 0,15(mol) \Rightarrow m_{Fe} = 0,15.56 = 8,4(gam)\\ n_{Cu} = n_{CuO} = 0,05(mol) \Rightarrow m_{Cu} = 0,05.64 = 3,2(gam)\\ b) n_{H_2} = 3n_{Fe_2O_3} + n_{CuO} = 0,075.3 + 0,05 = 0,275(mol)\\ V_{H_2} = 0,275.22,4 = 6,16(lít)\)

a, mFe2O3 = 32 . 75% = 24 (g)

nFe2O3 = 24/160 = 0,15 (mol)

mCuO = 32 - 24 = 8 (g)

nCuO = 8/80 = 0,1 (mol)

PTHH:

Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O

0,15 ---> 0,45 ---> 0,3 

CuO + H2 -> (t°) Cu + H2O

0,1 ---> 0,1 ---> 0,1

mFe = 0,3 . 56 = 16,8 (g)

mCu = 64 . 0,1 = 6,4 (g)

b, nH2 = 0,1 + 0,45 = 0,55 (mol)

VH2 = 0,55 . 22,4 = 12,32 (l)

c, PTHH:

2Al + 6HCl -> 2AlCl3 + 3H2

11/30 <--- 1,1 <--- 11/30 <--- 0,55

mAl = 11/30 . 27 = 9,9 (g)

mHCl = 1,1 . 36,5 = 40,15 (g)

Bài 11:

\(a,n_{Fe_2O_3}=\dfrac{1,6}{160}=0,01\left(mol\right)\\ n_{Cu}=\dfrac{4}{80}=0,05\left(mol\right)\\ PTHH:\\ Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\)

0,01 -----> 0,03 ---> 0,02

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

0,05 ---> 0,05 -> 0,05

\(b,m_{Fe}=0,02.56=1,12\left(g\right)\\ m_{Cu}=0,05.64=3,2\left(g\right)\\ V_{H_2}=\left(0,03+0,05\right).22,4=1,792\left(l\right)\)

Bài 12:

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\\ n_{O\left(trong.oxit\right)}=n_{H_2}=0,15\left(mol\right)\\ n_{Fe\left(trong.oxit\right)}=\dfrac{8-0,15,16}{56}=0,1\left(mol\right)\\ CTHH:Fe_xO_y\\ \Rightarrow x:y=0,1:0,15=2:3\\ CTHH:Fe_2O_3\)

\(n_{Fe_2O_3}=\dfrac{3,2}{160}=0,02mol\)

\(n_{Cu}=\dfrac{8}{80}=0,1mol\)

\(Fe_2O_3+3H_2\rightarrow\left(t^o\right)2Fe+3H_2O\)

 0,02      0,06             0,04                  ( mol )

\(CuO+H_2\rightarrow\left(t^o\right)Cu+H_2O\)

 0,1      0,1            0,1                ( mol )

\(m_{Fe}=0,04.56=2,24g\)

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

\(n_{H_2}=0,06+0,1=0,16mol\)

\(n_{Fe_2O_3}=\dfrac{3,2}{160}=0,02mol\)

\(m_{CuO}=\dfrac{8}{80}=0,1mol\)

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

\(CuO+H_2\rightarrow Cu+H_2O\)

\(m_{Fe}=0,02\cdot2\cdot56=2,24g\)

\(m_{Cu}=0,1\cdot64=6,4g\)

\(\Sigma n_{H_2}=0,02\cdot3+0,1=0,16mol\Rightarrow V_{H_2}=3,584l\)

a. PTHH: CuO + H₂ ---t^o---> Cu + H₂O (1)

Fe₂O₃ + 3H₂ ---t^o---> 2Fe + 3H₂O (2)

Ta có: \(m_{hh}=62,4\left(g\right)\)

=> \(m_{Fe}=62,4-12,8=49,6\left(g\right)\)

b. Theo PT₍₁₎: \(n_{H_2}=n_{Cu}=\dfrac{12,8}{64}=0,2\left(mol\right)\)

Theo PT₍₂₎:\(n_{H_2}=3.n_{Fe}=3.\dfrac{49,6}{56}\approx2,7\left(mol\right)\)

=> \(n_{H_{2_{\left(2PT\right)}}}=0,2+2,7=2,9\left(mol\right)\)

=> \(V_{H_2}=2,9.22,4=64,96\left(lít\right)\)