\(a,n_{Fe_2O_3}=\dfrac{8}{160}=0,05\left(mol\right)\\ PTHH:Fe_2O_3+3H_2\underrightarrow{t^o}2Fe+3H_2O\\ Mol:0,05\rightarrow0,15\rightarrow0,1\\ m_{Fe}=0,1.56=5,6\left(g\right)\\ b,V_{H_2}=0,15.22,4=3,36\left(l\right)\\ c,n_{O_2}=\dfrac{1,12}{22,4}=0,05\left(mol\right)\\ \\ PTHH:3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\\ LTL:\dfrac{0,1}{3}>\dfrac{0,05}{2}\Rightarrow Fe.dư\\ n_{Fe_3O_4}=\dfrac{0,05}{2}=0,025\left(mol\right)\\ m_{Fe_3O_4}=0,025.232=5,8\left(g\right)\)

nFe2O3 = 8 : 160 = 0,05 (mol) 
pthh: Fe2O3 + 3H2 -t--> 2Fe + 3H2O
         0,05--------0,15----->0,1 (mol) 
=> VH2= 0,15 . 22,4 = 3,36 (L) 
=> mFe = 0,1 . 56 = 5,6 (g) 
nO2  = 1,12 : 22,4 = 0,05 (mol) 
pthh : 2H2+ O2 -t-> 2H2O
 LTL :
0,15/2   > 0,05/1
=> H2 du 
theo pt , nH2O = 2 nO2 = 0,1 (mol) 
=> mH2O = 0,1 .18 = 1,8 (g) 

\(n_{PbO}=\dfrac{44,6}{223}=0,2\left(mol\right)\)

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: PbO + H₂ --t^o--> Pb + H₂O

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) => PbO dư, H₂ hết

PTHH: PbO + H₂ --t^o--> Pb + H₂O

            0,15<-0,15---->0,15

=> m_{rắn sau pư} = (0,2-0,15).223 + 0,15.207 = 42,2 (g)

H2+PbO-to>Pb+H2O

0,15---0,15----0,15

n H2=\(\dfrac{3,36}{22,4}\)=0,15 mol

n PbO=\(\dfrac{44,6}{233}\)=0,2 mol

=>PbO dư

=>m Pb=0,15.207=31,05g

=>m PbO dư=0,05.233=11,65g

\(n_{PbO}=\dfrac{44,6}{223}=0,2\left(mol\right)\)

\(n_{H_2}=\dfrac{3,36}{22,4}=0,15\left(mol\right)\)

PTHH: PbO + H₂ --t^o--> Pb + H₂O

Xét tỉ lệ: \(\dfrac{0,2}{1}>\dfrac{0,15}{1}\) => PbO dư, H₂ hết

PTHH: PbO + H₂ --t^o--> Pb + H₂O

            0,15<-0,15----->0,15

=> m_{rắn sau pư} = 44,6 - 0,15.223 + 0,15.207 = 42,2 (g)

PTHH: \(Fe_xO_y+yH_2\underrightarrow{t^o}xFe+yH_2O\)

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

Đặt \(\left\{{}\begin{matrix}n_{Fe\left(oxit\right)}=a\left(mol\right)=n_{H_2}\\n_{O\left(oxit\right)}=b\left(mol\right)\end{matrix}\right.\)

Ta có: \(m_{tăng}=m_{Fe}-m_{H_2}\) \(\Rightarrow56a-2a=3,24\) \(\Rightarrow a=n_{Fe}=0,06\left(mol\right)\)

Hỗn hợp D gồm \(\left\{{}\begin{matrix}n_{CO_2\left(dư\right)}=c\left(mol\right)\\n_{H_2O}=n_{O\left(oxit\right)}=b\left(mol\right)\end{matrix}\right.\)

Ta có hệ phương trình: \(\left\{{}\begin{matrix}c+b=0,1\\18b+2c=7,4\cdot2\cdot\left(b+c\right)\end{matrix}\right.\) \(\Leftrightarrow\left\{{}\begin{matrix}b=0,08\\c=0,02\end{matrix}\right.\)

\(\Rightarrow x:y=a:b=0,06:0,08=3:4\)

\(\Rightarrow\)  Công thức cần tìm là Fe₃O₄ 

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

Ta có: \(n_{H_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

\(n_{Fe_2O_3}=\dfrac{6,64}{160}=0,0415\left(mol\right)\)

Xét tỉ lệ: \(\dfrac{0,0415}{1}>\dfrac{0,1}{3}\) , ta được Fe₂O₃ dư.

Chất rắn thu được gồm: Fe và Fe₂O₃ dư.

Theo PT: \(n_{Fe}=\dfrac{2}{3}n_{H_2}=\dfrac{1}{15}\left(mol\right)\)

 \(n_{Fe_2O_3\left(pư\right)}=\dfrac{1}{3}n_{H_2}=\dfrac{1}{30}\left(mol\right)\)

\(\Rightarrow n_{Fe_2O_3\left(dư\right)}=\dfrac{49}{6000}\left(mol\right)\)

⇒ m _{chất rắn} = m_Fe + m_{Fe2O3 (dư)} = 1/15.56 + 49/6000.160 = 5,04 (g)

Bạn tham khảo nhé!

\(n_{Fe}=\dfrac{5.6}{56}=0.1\left(mol\right)\)

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

\(0.05........0.15......0.1\)

\(\%Fe_2O_{3\left(bk\right)}=\dfrac{0.05\cdot160}{20}\cdot100\%=40\%0\%\)

\(V_{H_2}=0.15\cdot22.4=3.36\left(l\right)\)

\(m_X=20-0.05\cdot160+5.6=17.6\left(g\right)\)

a) $CuO + H_2 \xrightarrow{t^o} Cu + H_2O$