\(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)\\ PTHH:CO_2+Ba\left(OH\right)_2\rightarrow BaCO_3+H_2O\\ \Rightarrow n_{Ba\left(OH\right)_2}=n_{CO_2}=0,2\left(mol\right)\\ \Rightarrow C_{M_{Ba\left(OH\right)_2}}=\dfrac{0,2}{0,2}=1M\)

Bạn sửa lại đề thì chọn A nha

a/ \(n_{CO_2}=\dfrac{7,437}{24,79}=0,3\left(mol\right)\)

PTHH: CO₂ + Ba(OH)₂ → BaCO₃ + H₂O

Mol:     0,3          0,3

b/ \(C_{M_{ddBa\left(OH\right)_2}}=\dfrac{0,3}{0,2}=1,5M\)

a, \(CO_2+Ca\left(OH\right)_2\rightarrow CaCO_3+H_2O\)

b, \(n_{CO_2}=\dfrac{5,6}{22,4}=0,25\left(mol\right)\)

\(n_{Ca\left(OH\right)_2}=n_{CO_2}=0,25\left(mol\right)\Rightarrow C_{M_{Ca\left(OH\right)_2}}=\dfrac{0,25}{0,2}=1,25\left(M\right)\)

c, \(Ca\left(OH\right)_2+2HCl\rightarrow CaCl_2+2H_2O\)

Theo PT: \(n_{HCl}=2n_{Ca\left(OH\right)_2}=0,5\left(mol\right)\)

\(\Rightarrow m_{ddHCl}=\dfrac{0,5.36,5}{15\%}\approx121,67\left(g\right)\)

\(n_{CO_2}=\dfrac{5,6}{22,4}=0,25mol\\ a)CO_2+Ca\left(OH\right)_2\rightarrow Ca\left(OH\right)_2+H_2O\)

    0,25       0,25                0,25

\(b)C_{M_{Ca\left(OH\right)_2}}=\dfrac{0,25}{0,2}=1,25M\\ c)2HCl+Ca\left(OH\right)_2\rightarrow CaCl_2+2H_2O\\ n_{HCl}=2n_{Ca\left(OH\right)_2}=2.0,25=0,5mol\\ m_{ddHCl}=\dfrac{0,5.36,5}{15\%}\cdot100\%\approx121,67g\)

PTHH: \(CO_2+Ba\left(OH\right)_2\rightarrow BaCO_3+H_2O\)

Ta có: \(n_{CO_2}=\dfrac{4,48}{22,4}=0,2\left(mol\right)=n_{Ba\left(OH\right)_2}=n_{BaCO_3}\) \(\Rightarrow\left\{{}\begin{matrix}C_{M_{Ba\left(OH\right)_2}}=\dfrac{0,2}{0,2}=1\left(M\right)\\m_{BaCO_3}=0,2\cdot197=39,4\left(g\right)\end{matrix}\right.\)

CMddBa(OH)2=0,10,2=0,5MCMddBa(OH)2=0,10,2=0,5M

c, mBaCO3=0,1.197=19,7(g)

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

nCO2=3.36/22.4=0.15(mol)

nCO2=nCa(OH)2=0.15(mol)

200ml=0.2l

b/CMCa(OH)2= 0.15/0.2=0.75(M)

c/nCaCO3=nCO2=0.15(mol)

mCaCO3= 0.15 x 106=15.9(g)

nCO₂ =\(\dfrac{4,48}{22,4}\)=0,2 mol 

PTHH CO₂  + Ba(OH)₂ --> BaCO₃  + H₂O

CO₂ phản ứng vừa đủ với Ba(OH)₂ => nBa(OH)₂ = 0,2 mol

=> mBa(OH)₂ = 0,2.171 = 34,2 gam

khối lượng 200ml dung dịch Ba(OH)₂ có d = 1,12g/ml = 200.1,12 = 224 gam

C%_Ba(OH)2 = \(\dfrac{m_{\left(ct\right)}}{m_{\left(dd\right)}}.100\)= \(\dfrac{34,2}{224}.100\)= 15,27%