Đặt :
nCuO = x mol
nFe2O3 = y mol
CuO + CO -to-> Cu + CO2
x_____________x_____x
Fe2O3 + 3CO -to-> 2Fe + 3CO2
y________________2y____3y
nBa(OH)2 = 0.2 mol
nNaOH = 0.2 mol
nBaCO3 = 0.15 mol
Ba(OH)2 + CO2 --> BaCO3 + H2O (2)
Ba(OH)2 + 2CO2 --> Ba(HCO3)2 (3)
2NaOH + CO2 --> Na2CO3 + H2O (4)
NaOH + CO2 --> NaHCO3 (5)
TH1: Xảy ra (2) , (3) , (4)
Ba(OH)2 + CO2 --> BaCO3 + H2O
0.15______0.15______0.15
Ba(OH)2 + 2CO2 --> Ba(HCO3)2
0.2-0.15___0.1
2NaOH + CO2 --> Na2CO3 + H2O
0.2_______0.1
nCO2 = 0.15 + 0.1 + 0.1 = 0.35 mol
nCO2 = nO (trong oxit) = 0.35 mol
mO = 0.35*16=5.6 g
mKl = mOxit - mO = 24 - 5.6 = 18.4 g
TH2: Xảy ra (2) , (3) , (5)
Ba(OH)2 + CO2 --> BaCO3 + H2O
0.15______0.15______0.15
Ba(OH)2 + 2CO2 --> Ba(HCO3)2
0.2-0.15___0.1
NaOH + CO2 --> NaHCO3
0.2______0.2
nCO2 = 0.15 + 0.1 + 0.2 = 0.45 mol
nCO2 = nO (trong oxit) = 0.45 mol
mO = 0.45*16=7.2 g
mKl = mOxit - mO = 24 - 7.2 = 16.8 g
CuO+CO---->Cu+CO2
x------------------------x
Fe2O3+3C0---->2Fe+3CO2
y------------------------3y
CO2+Ba(OH)2--->BaCO3+H2O(2)
0,15------0,15--------0,15
Ba(OH)2+2CO2----->Ba(HCO3)2(3)
0,05-------0,1
CO2+2NaOH--->Na2CO3+H2O(4)
0,2-------0,1
CO2+NaOH--->NaHCO3
n Ba(OH)2=0,2.1=0,2(mol)
n NaOH=0,2(mol)
n Ba2CO3=0,15(mol)
TH1=> Xảy ra pt 2,3,4
n CO2=0,35(mol)
nO=0,35(mol)
m O=5,6(g)
m KL=24-5,6=18,4(g_
TH2--->Xảy ra phản ứng 2,3,5
Làm tương tự dc mKL=16,8(g)