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

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

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

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

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

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

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

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

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

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)

Câu 5:

PTHH : H2+ Cl2 -to-> 2 HCl

Vì số mol , tỉ lệ thuận theo thể tích , nên ta có:

25/1 = 25/1 => P.ứ hết, không có chất dư, tính theo chất nào cũng được

=> V(HCl)= 2. V(H2)= 2. 25= 50(l)

Câu 4: mFe2O3= 0,6. 80= 48(g)

=> nFe2O3= 48/160=0,3(mol)

mCuO= 80-48=32(g) => nCuO=32/80=0,4(mol)

PTHH: CuO + CO -to-> Cu + CO2
0,4_______0,4_____0,4____0,4(mol)

Fe2O3 + 3 CO -to-> 2 Fe +3 CO2

0,3_____0,9____0,6______0,9(mol)

=>nCO= 0,4+ 0,9= 1,3(mol)

=> V(CO, đktc)= 1,3. 22,4=29,12(l)

a. \(n_{H_2}=\dfrac{9.10^{23}}{6.10^{23}}=1,5\left(mol\right)\)

PTHH : Fe₂O₃ + 3H₂ -> 2Fe + 3H₂O

           0,5          1,5         1

\(m_{Fe_2O_3}=0,5.160=80\left(g\right)\)

b. \(m_{Fe}=1.56=56\left(g\right)\)

nH2 = 9.10^23/6.10^23 = 1,5 (mol)

PTHH: Fe2O3 + 3H2 -> (t°) 2Fe + 3H2O

Mol: 0,5 <--- 1,5 ---> 1

mFe2O3 = 0,5 . 160 = 80 (g)

mFe = 1 . 56 = 56 (g)

Fe₂O₃+3H₂-to>2Fe+3H₂O

0,5-------1,5---------1 mol

n _H2=\(\dfrac{9,10^{23}}{6.10^{23}}\)=1,5 mol

=>m _Fe3O4=0,5.232=116g

=>m _Fe=1.56=56g

a, PT: \(CuO+H_2\underrightarrow{t^o}Cu+H_2O\)

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

b, Ta có: \(m_{Fe_2O_3}=50.80\%=40\left(g\right)\Rightarrow n_{Fe_2O_3}=\dfrac{40}{160}=0,25\left(mol\right)\)

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

Theo PT: \(\left\{{}\begin{matrix}n_{Cu}=n_{CuO}=0,125\left(mol\right)\\n_{Fe}=2n_{Fe_2O_3}=0,5\left(mol\right)\end{matrix}\right.\)

\(\Rightarrow\left\{{}\begin{matrix}m_{Cu}=0,125.64=8\left(g\right)\\m_{Fe}=0,5.56=28\left(g\right)\end{matrix}\right.\)

b, Theo PT: \(n_{H_2}=n_{CuO}+3n_{Fe_2O_3}=0,875\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,875.22,4=19,6\left(l\right)\)

Bạn tham khảo nhé!

a) \(m_{CuO}=\dfrac{20.40}{100}=8\left(g\right)\) => \(n_{CuO}=\dfrac{8}{80}=0,1\left(mol\right)\)

\(m_{Fe_2O_3}=20-8=12\left(g\right)\) => \(n_{Fe_2O_3}=\dfrac{12}{160}=0,075\left(mol\right)\)

PTHH: CuO + H₂ --t^o--> Cu + H₂O

             0,1--->0,1------>0,1

            Fe₂O₃ + 3H₂ --t^o--> 2Fe + 3H₂O

          0,075--->0,225----->0,15

=> m_Cu = 0,1.64 = 6,4 (g)

=> m_Fe = 0,15.56 = 8,4 (g)

b) \(V_{H_2}=\left(0,1+0,225\right).22,4=7,28\left(l\right)\)