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\(n_P=\dfrac{6,2}{31}=0,2\left(mol\right)\\ n_{O_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\\ PTHH:4P+5O_2\underrightarrow{t^o}2P_2O_5\\ LTL:\dfrac{0,2}{4}< \dfrac{0,4}{5}\Rightarrow O_2dư\)

\(n_{O_2\left(pư\right)}=\dfrac{5}{4}n_P=\dfrac{5}{4}.0,2=0,25\left(mol\right)\\ n_{O_2\left(dư\right)}=0,4-0,25=0,15\left(mol\right)\)

\(n_{P_2O_5\left(lt\right)}=\dfrac{1}{2}n_P=\dfrac{1}{2}.0,2=0,1\left(mol\right)\\ m_{P_2O_5\left(lt\right)}=0,1.142=14,2\left(g\right)\\ m_{P_2O_5\left(tt\right)}=0,1.142.80\%=11,36\left(g\right)\)

a.\(n_{KMnO_4}=\dfrac{m}{M}=\dfrac{31,6}{158}=0,2mol\)

\(PTHH:2KMnO_4\underrightarrow{np}K_2MnO_4+MnO_2+O_2\)

                     2                 1                1          1           ( mol )

                   0,2                                             0,1

\(V_{O_2}=n.22,4=0,1.22,4=2,24l\)

b.\(n_{Fe}=\dfrac{m}{M}=\dfrac{11,2}{56}=0,2mol\) 

\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

      3         2        1     ( mol )

    0,2      0,1

      0,1    0,1      0,05     ( mol )

\(m_{Fe_3O_4}=n.M=0,05.232=11,6g\)

\(a,n_{Fe}=\dfrac{11,2}{56}=0,2\left(mol\right)\\ n_{O_2}=\dfrac{2,24}{22,4}=0,1\left(mol\right)\)

PTHH: 3Fe + 2O₂ --t^o--> Fe₃O4

LTL: \(\dfrac{0,2}{3}>\dfrac{0,1}{2}\) => Fe dư

b, Theo pthh: \(n_{Fe\left(pư\right)}=\dfrac{3}{2}n_{O_2}=\dfrac{3}{2}.0,1=0,15\left(mol\right)\)

\(\Rightarrow m_{Fe\left(dư\right)}=\left(0,2-0,15\right).56=2,8\left(g\right)\)

\(n_{Fe}=\dfrac{6.72}{56}=0.12\left(mol\right)\)

\(n_{Cl_2}=\dfrac{3.36}{22.4}=0.15\left(mol\right)\)

\(2Fe+3Cl_2\underrightarrow{^{t^0}}2FeCl_3\)

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

\(m_{Fe\left(dư\right)}=\left(0.12-0.1\right)\cdot56=1.12\left(g\right)\)

\(m_{FeCl_3}=0.1\cdot162.5=16.25\left(g\right)\)

a)

Theo ĐLBTKL: \(m_{Fe\left(bđ\right)}+m_{O_2}=m_X\)

=> \(m_{O_2}=26,4-20=6,4\left(g\right)\)

=> \(n_{O_2}=\dfrac{6,4}{32}=0,2\left(mol\right)\Rightarrow V=0,2.22,4=4,48\left(l\right)\)

b)

PTHH: 3Fe + 2O₂ --t^o--> Fe₃O₄

                       0,2------->0,1

=> \(\%m_{Fe_3O_4}=\dfrac{0,1.232}{26,4}.100\%=87,88\%\)

c)

- Nếu dùng KClO₃

PTHH: 2KClO₃ --t^o--> 2KCl + 3O₂

             \(\dfrac{0,4}{3}\)<-----------------0,2

=> \(m_{KClO_3}=\dfrac{0,4}{3}.122,5=\dfrac{49}{3}\left(g\right)\)

- Nếu dùng KMnO₄:

PTHH: 2KMnO₄ --t^o--> K₂MnO₄ + MnO₂ + O₂

               0,4<--------------------------------0,2

=> \(m_{KMnO_4}=0,4.158=63,2\left(g\right)\)

a, PT: \(2Cu+O_2\underrightarrow{t^o}2CuO\)

\(3Fe+2O_2\underrightarrow{t^o}Fe_3O_4\)

\(4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

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

\(Fe_3O_4+4H_2\underrightarrow{t^o}3Fe+4H_2O\)

Gọi: \(\left\{{}\begin{matrix}n_{Cu}=x\left(mol\right)\\n_{Fe}=y\left(mol\right)\\n_{Al}=z\left(mol\right)\end{matrix}\right.\) ⇒ 64x + 56y + 27z = 40,4 (1)

Theo PT: \(\left\{{}\begin{matrix}n_{CuO}=n_{Cu}=x\left(mol\right)\\n_{Fe_3O_4}=\dfrac{1}{3}n_{Fe}=\dfrac{1}{3}y\left(mol\right)\\n_{Al_2O_3}=\dfrac{1}{2}n_{Al}=\dfrac{1}{2}z\left(mol\right)\end{matrix}\right.\)

⇒ 80x + 232.1/3x + 102.1/2z = 59,6 (2)

- Chất rắn A gồm: Cu, Fe và Al₃O₃.

⇒ 64x + 56y + 102.1/2z = 50 (3)

Từ (1), (2) và (3) \(\Rightarrow\left\{{}\begin{matrix}x=0,2\left(mol\right)\\y=0,3\left(mol\right)\\z=0,4\left(mol\right)\end{matrix}\right.\)

⇒ m_Cu = 0,2.64 = 12,8 (g)

m_Fe = 0,3.56 = 16,8 (g)

m_Al = 0,4.27 = 10,8 (g)

b, Theo PT: \(n_{H_2}=n_{Cu}+\dfrac{4}{3}n_{Fe}=0,6\left(mol\right)\)

\(\Rightarrow V_{H_2}=0,6.22,4=13,44\left(l\right)\)