PTHH:

\(4FeS+7O_2-->2Fe_2O_3+4SO_2\)

_0,4___0,7________0,2________0,4

\(n_{SO_2}=\dfrac{8,96}{22,4}=0,4\left(mol\right)\)

=>\(m_{FeS}=0,4.88=35,2\left(g\right)\)

=>\(m_{Fe_2O_3}=0,2.160=32\left(g\right)\)

_0.4__0.7_______0.2_____0.4 là j vậy bạn

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

a, \(n_{Fe}=\dfrac{11}{56}\left(kmol\right)\)

Theo PT: \(n_{Fe_3O_4\left(LT\right)}=\dfrac{1}{3}n_{Fe}=\dfrac{11}{168}\left(kmol\right)\)

\(\Rightarrow m_{Fe_3O_4\left(LT\right)}=\dfrac{11}{168}.232=\dfrac{319}{21}\left(kg\right)\) > m_{Fe3O4 (TT)} = 200 (kg)

→ vô lý

Bạn xem lại đề phần a nhé.

b, \(n_{Fe_3O_4}=\dfrac{23,2}{232}=0,1\left(kmol\right)\)

Theo PT: \(n_{Fe\left(LT\right)}=3n_{Fe_3O_4}=0,3\left(kmol\right)\)

\(\Rightarrow m_{Fe\left(LT\right)}=0,3.56=16,8\left(kg\right)\)

Mà: H = 85%

\(\Rightarrow m_{Fe\left(TT\right)}=\dfrac{16,8}{85\%}=\dfrac{336}{17}\left(kg\right)\)

\(n_{Fe_3O_4}=\dfrac{m}{M}=\dfrac{23,2}{56.3+16.4}=\dfrac{23.2}{232}=0,1\left(mol\right)\)

\(Fe_3O_4+4CO\xrightarrow[t^o]{}3Fe+4CO_2\)

1 : 4 : 3 : 4

\(0,1\rightarrow0,4\rightarrow0,3\rightarrow0,4\left(mol\right)\)

\(V_{CO}=n.22,4=0,4.22,4=8,96\left(l\right)\)

b) \(m_{Fe}=n.M=0,3.56=16,8\left(g\right)\)

a, \(2Zn+O_2\underrightarrow{t^o}2ZnO\) - pư hóa hợp

b, \(2Fe\left(OH\right)_3\underrightarrow{t^o}Fe_2O_3+3H_2O\) - pư phân hủy

c, \(CaO+H_2O\rightarrow Ca\left(OH\right)_2\) - pư hóa hợp

d, \(2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\) - pư phân hủy

\(Fe2O3+3H2-->2Fe+3H2O\)

b) \(n_{Fe2O3}=\frac{16}{160}=0,1\left(mol\right)\)

\(n_{H2}=\frac{8}{2}=4\left(mol\right)\)

\(\frac{4}{3}>\frac{0,1}{1}\Rightarrow H2\) dư

\(n_{H2}=3n_{Fe2O3}=0,3\left(mol\right)\)

\(n_2dư=4-0,3=3,7\left(mol\right)\)

\(m_{H2}dư=3,7.2=7,4\left(g\right)\)

c) \(n_{Fe}=2n_{Fe2O3}=0,2\left(mol\right)\)

\(m_{Fe}=0,2.56=11,2\left(g\right)\)

d) n\(_{H2O}=3n_{Fe2O3}=0,3\left(mol\right)\)

Số phân tử H2O = \(0,3.6.10^{23}=1,8.10^{23}\) (phân tử)

Bài 5:

\(1:4Al+3O_2\underrightarrow{t^o}2Al_2O_3\)

2: \(2Al\left(OH\right)_3\underrightarrow{t^o}Al_2O_3+3H_2O\)

\(3:Al_2O_3+6HCl\rightarrow2AlCl_3+3H_2O\)

4: \(2Al+6HCl\rightarrow2AlCl_3+3H_2\uparrow\)

5: \(CH_4+2O_2\underrightarrow{t^o}CO_2+2H_2O\)

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

7: \(K_2O+H_2O\rightarrow2KOH\)

8: \(2Na+2H_2O\rightarrow2NaOH+H_2\uparrow\)

9: \(2Fe+3Cl_2\underrightarrow{t^o}2FeCl_3\)

10: \(CaCl_2+Na_2CO_3\rightarrow CaCO_3\downarrow+2NaCl\)

thiếu 4 bài rồi bạn

Đáp án : B

Đáp án B

Các phản ứng oxi hóa khử gồm : (1), (3), (5), (6)