2KMnO4-to-->K2MnO4+O2+MnO2

O2+2C dư-to-->2CO

2CO+O2-to-->2CO2

CO2+Ca(OH)2-->CaCO3+H2O

CaCO3-to-->Cao+co2

1.

a;

2H₂O -> 2H₂ + O₂

H₂ + CuO -> Cu + H₂O

Cu +4 HNO₃ -> Cu(NO₃)₂ + 2NO₂ + 2H₂O

2Cu(NO₃)₂ -> 2CuO + 4NO₂ + O₂

CuO + CO -> Cu + CO₂

Ca + 2H₂O -> Ca(OH)₂ + H₂

Ca(OH)₂ + CO₂ -> CaCO₃ + H₂O

n_CaCO3=0,05(mol)

Ta có:

n_CaCO3=n_Ca=,05(mol)

m_Ca=40.0,05=2(g)

b;

2KMnO₄ -> K₂MnO₄ + MnO₂ + O₂

C + O₂ -> CO₂

CO₂ + 2NaOH -> Na₂CO₃ + H₂O

Na₂CO₃ + CO₂ + H₂O -> 2NaHCO₃

2NaHCO₃ -> Na₂CO₃ + CO₂ + H₂O

B là \(O_2\)

C là \(H_2O\)

D là \(KOH\)

E là \(Cu\left(OH\right)_2\)

Từ trái qua 

1) \(2KMnO_4\underrightarrow{t^0}K_2MnO_4+MnO_2+O_2\)

2) \(O_2+2H_2\underrightarrow{t^0}2H_2O\)

3) \(H_2O+K_2O\rightarrow2KOH\)

4) \(2KOH+Cu\left(NO_3\right)_2\rightarrow2KNO_3+Cu\left(OH\right)_2\)

5) \(Cu\left(OH\right)_2\underrightarrow{t^0}CuO+H_2O\)

\(B:O_2\\ C:CuO\\ D:CuCl_2\\ E:Cu\left(OH\right)_2\)

PTHH:

\(KMnO_4\rightarrow B:2KMnO_4\underrightarrow{t^o}K_2MnO_4+MnO_2+O_2\)

\(B\rightarrow C:O_2+2Cu\underrightarrow{t^o}2CuO\)

\(C\rightarrow D:CuO+2HCl\rightarrow CuCl_2+H_2O\)

\(D\rightarrow E:CuCl_2+2NaOH\rightarrow Cu\left(OH\right)_2+2NaCl\)

\(E\rightarrow D:Cu\left(OH\right)_2\underrightarrow{t^o}CuO+H_2O\)

bên chỗ hocmai, bn Nguyễn Thị Ngọc Bảo đã giúp bn rồi nên có lẽ bn k cần nx nhỉ

\(A\rightarrow B\rightarrow C\rightarrow D\rightarrow Cu\) Ta có thứ tự sau: \(CuO\rightarrow Cu\left(OH\right)_2\rightarrow CuCl_2\rightarrow Cu\left(NO_3\right)_2\rightarrow Cu\)PTHH: \(CuO+H_2O\rightarrow Cu\left(OH\right)_2\) \(Cu\left(OH\right)_2+2HCl\rightarrow CuCl_2+2H_2O\) \(CuCl_2+2AgNO_3\rightarrow Cu\left(NO_3\right)_2+2AgCl\downarrow\) \(Cu\left(NO_3\right)_2+Fe\rightarrow Fe\left(NO_3\right)_2+Cu\downarrow\)

Ở dưới có E là sao bạn

A : CuO

B: \(Cu\left(NO_3\right)_2\)

C : \(Cu\left(OH\right)_2\)

\(D:CuCl_2\)

PTHH :

\(CuO+2HNO_3-->Cu\left(NO_3\right)_2+H_2O\)

\(Cu\left(NO_3\right)_2+2NaOH-->Cu\left(OH\right)_2+2NaNO_3\)

\(Cu\left(OH\right)_2+HCl-->CuCl_2+2H_2O\)

\(CuCl_2-dp\text{dd}->Cu+Cl_2\)

\(A:Fe\\ B:Fe_3O_4\\C: H_2O\\ D:H_2\\ PTHH:3Fe+2O_2\rightarrow\left(t^o\right)Fe_3O_4\\Fe_3O_4+8HCl\rightarrow FeCl_2+2FeCl_3+4H_2O\\ 2H_2O\rightarrow\left(đpdd\right)2H_2+O_2\\4H_2+Fe_3O_4\rightarrow \left(t^o\right)3Fe+4H_2O\)

a) CuSO₄+2NaOH\(\rightarrow\)Cu(OH)₂+Na₂SO₄

Cu(OH)₂\(\rightarrow\)CuO+H₂O

CuO+2HCl\(\rightarrow\)CuCl₂+H₂O

Fe+CuCl₂\(\rightarrow\)FeCl₂+Cu