\(n_{H_2}=\dfrac{17.92}{22.4}=0.8\left(mol\right)\)

\(n_{Fe_3O_4}=\dfrac{69.6}{232}=0.3\left(mol\right)\)

\(Fe_3O_4+4H_2\underrightarrow{t^0}3Fe+4H_2O\)

\(0.2..............0.8\)

\(m_{Fe_3O_4\left(dư\right)}=\left(0.3-0.2\right)\cdot232=23.2\left(g\right)\)

\(Zn+2HCl\rightarrow ZnCl_2+H_2\)

\(0.8......................................0.8\)

\(m_{Zn}=0.8\cdot65=52\left(g\right)\)

\(a,PTHH:Fe_3O_4+4H_2\xrightarrow{t^o}3Fe+4H_2O\\ n_{H_2}=\dfrac{6,72}{22,4}=0,3(mol);n_{Fe_3O_4}=\dfrac{46,4}{232}=0,2(mol)\)

Vì \(\dfrac{n_{H_2}}{4}<\dfrac{n_{Fe_3O_4}}{1}\) nên \(Fe_3O_4\) dư

\(n_{Fe_3O_4(dư)}=0,2-\dfrac{0,3}{4}=0,125(mol)\\ \Rightarrow m_{Fe_3O_4(dư)}=0,125.232=29(g)\\ b,n_{Fe}=\dfrac{3}{4}n_{H_2}=0,225(mol)\\ \Rightarrow m_{Fe}=0,225.56=12,6(g)\)

\(a) n_P = \dfrac{18,6}{31} = 0,6(mol)\\ n_{O_2} = \dfrac{20,16}{22,4} = 0,9(mol)\\ 4P + 5O_2 \xrightarrow{t^o} 2P_2O_5\\ \dfrac{n_P}{4} = 0,15 < \dfrac{n_{O_2}}{5} = 0,18 \to O_2\ dư\\ n_{O_2\ pư} = \dfrac{5}{4}n_P = 0,75(mol)\\ \Rightarrow m_{O_2\ dư} = (0,9-0,75).32 = 4,8(gam)\\ b) n_{Fe} = \dfrac{56}{56} = 1(mol)\)

\(3Fe + 2O_2 \xrightarrow{t^o} Fe_3O_4\\ \dfrac{n_{Fe}}{3} = \dfrac{1}{3}<\dfrac{n_{O_2}}{2} = 0,45\to Fe\ cháy\ hết.\\ c)\ 2KMnO_4 \xrightarrow{t^o} K_2MnO_4 + MnO_2 + O_2\\ n_{KMnO_4} = 2n_{O_2} = 0,9.2 = 1,8(mol)\\ \Rightarrow m_{KMnO_4} = 1,8.158 =284,4(gam)\)

a)\(n_{H_2}=\dfrac{10,08}{22,4}=0,45\left(m\right)\)

\(n_{Fe_2O_3}=\dfrac{48}{160}=0,3\left(m\right)\)

\(PTHH:Fe_2O_3+3H_2\underrightarrow{ }2Fe+3H_2O\)

ta có  tỉ lệ:\(\dfrac{0,45}{3}< \dfrac{0,3}{1}->H_2dư\)

H₂ còn lại sau phản ứng

\(n_{H_2\left(dư\right)}=0,3-0,15=0,15\left(m\right)\)

\(m_{H_2\left(dư\right)}=0,15.2=0,3\left(g\right)\)

b)\(PTHH:Zn+2HCl\underrightarrow{ }ZnCl_2+H_2\)

tỉ lệ           :1         2         1              1

số mol      :0,15    0,3      0,15         0,15

\(m_{Zn}=0,15.65=9,75\left(g\right)\)

Cíu pls

PTHH: 4H₂ + Fe₃O₄ ➞ 3Fe + 4H₂O

a) \(n_{H_2}=\dfrac{17,92}{22,4}=0,8\) (mol)

\(n_{Fe_3O_4}=\dfrac{69,6}{232}=0,3\) (mol)

Lập tỉ số: \(\dfrac{0,8}{4}=0,2\) < \(\dfrac{0,3}{1}=0,3\)

⇒ H₂ hết, Fe₃O₄ dư

Theo PT: \(n_{Fe_3O_4}=\dfrac{1}{4}n_{H_2}=\dfrac{1}{4}.0,8=0,2\) (mol)

⇒ \(n_{Fe_3O_4}\)dư = 0,3 - 0,2 = 0,1 (mol)

⇒ \(m_{Fe_3O_4}\)dư = 0,1 . 232 = 23,2 (g)

b) Theo PT: \(n_{Fe}=\dfrac{3}{4}n_{H_2}=\dfrac{3}{4}.0,8=0,6\) (mol)

⇒ m_Fe= 0,6 . 56 = 33,6 (g)

Fe₃O₄ + 4H₂ -> 3Fe + 4H₂O

n_H2=0,8(mol)

n_Fe3O4=0,3(mol)

Vì \(\dfrac{0,8}{4}< 0,3\) nên sau PƯ thì Fe₃O₄ dư 0,1(mol)

m_{Fe3O4 dư}=0,1.232=23,2(g)

Theo PTHH ta có:

n_Fe=\(\dfrac{3}{4}\)n_H2=0,6(mol)

m_Fe=56.0,6=33,6(g)

\(a) n_{Fe_3O_4} = a(mol) ; n_{CuO} = b(mol)\\ \Rightarrow 232a + 80b = 117,6(1)\\ Fe_3O_4 + 4H_2 \xrightarrow{t^o} 3Fe + 4H_2O\\ CuO + H_2 \xrightarrow{t^o} Cu + H_2O\\ n_{H_2} = 4a + b = \dfrac{40,32}{22,4}=1,8(2)\\ (1)(2)\Rightarrow a = 0,3 ;b = 0,6\\ \%m_{Fe_3O_4} = \dfrac{0,3.232}{117,6}.100\% =59,18\%\\ \%m_{CuO} = 100\%-59,18\% = 40,82\%\)

\(b)\\ n_{Fe} = 3a = 0,9(mol)\\ n_{Cu} = b = 0,6(mol)\\ \%m_{Fe} = \dfrac{0,9.56}{0,9.56+0,6.64}.100\% = 56,76\%\\ \%m_{Cu} = 100\% - 56,76\% = 43,24\%\)

PTHH:

4H2+Fe3O4----->3Fe+4H2O

nH2=V/22,4=6,72/22,4=0,3mol

Theo PTHH:4molH2--->3molFe 0,3molH2->0,3.3/4=0,225molFe

mFe=nFe.M=0,225.56=12,6g

nO= nH2O= nH2= 0,3(mol)

m=m(oxit) - mO= 24- 0,3.16= 19,2(g)

đây nè bạn!