А) 1. 2Fe + 3Cl2 = 2FeCl3
2. FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl
3. 2Fe(OH)3 = Fe2O3 + 3H2O
Б) 1) Fe + 2HCl = FeCl2 + H2
2. FeCl2 + 2NaOH = Fe(OH)2 + 2NaCl
3. Fe(OH)2 + 2CH3COOH = (CH3COO)2Fe + 2H2O
4. (CH3COO)2Fe + Na2S = FeS + 2CH3COONa
B) 1. 2Cu + O2 = 2CuO
2. CuO + 2HCl = CuCl2 + H2O
3. CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
4. Cu(OH)2 + H2SO4 = CuSO4 + 2H2O
5. CuSO4 + 2Na = Cu + Na2SO4
Г) 1. ZnCO3 + H2SO4 = ZnSO4 + H2O + CO2
2. ZnSO4 + 2NaOH = Zn(OH)2 + Na2SO4
3. Zn(OH)2 + 2NaOH = Na2[Zn(OH)4]
4. Na2[Zn(OH)4] + 4HCl = ZnCl2 + 2NaCl + 4H2O
А) 1. 2Fe + 3Cl2 = 2FeCl3
2. FeCl3 + 3NaOH = Fe(OH)3 + 3NaCl
3. 2Fe(OH)3 = Fe2O3 + 3H2O
Б) 1) Fe + 2HCl = FeCl2 + H2
2. FeCl2 + 2NaOH = Fe(OH)2 + 2NaCl
3. Fe(OH)2 + 2CH3COOH = (CH3COO)2Fe + 2H2O
4. (CH3COO)2Fe + Na2S = FeS + 2CH3COONa
B) 1. 2Cu + O2 = 2CuO
2. CuO + 2HCl = CuCl2 + H2O
3. CuCl2 + 2NaOH = Cu(OH)2 + 2NaCl
4. Cu(OH)2 + H2SO4 = CuSO4 + 2H2O
5. CuSO4 + 2Na = Cu + Na2SO4
Г) 1. ZnCO3 + H2SO4 = ZnSO4 + H2O + CO2
2. ZnSO4 + 2NaOH = Zn(OH)2 + Na2SO4
3. Zn(OH)2 + 2NaOH = Na2[Zn(OH)4]
4. Na2[Zn(OH)4] + 4HCl = ZnCl2 + 2NaCl + 4H2O
M(NaOH) = 23+16+1 = 40 г/моль
n(NaOH) = m/M = 40/40 = 1 моль
n(Fe(OH)3) = n(NaOH)/3 = 1/3 = 0.33 моль
M(Fe(OH)3)= 56+(16+1)*3 = 107 г/моль
m(Fe(OH)3)= n*M = 0.33*107 = 35.31 г