\(a,PTHH:SO_2+Ca(OH)_2\to CaSO_3\downarrow+H_2O\\ b,n_{Ca(OH)_2}=0,7.0,01=0,007(mol)\\ n_{SO_2}=\dfrac{0,112}{22,4}=0,005(mol)\)

Vì \(\dfrac{n_{SO_2}}{1}<\dfrac{n_{Ca(OH)_2}}{1}\) nên \(Ca(OH)_2\) dư

\(\Rightarrow n_{CaSO_3}=n_{H_2O}=0,005(mol)\\ \Rightarrow m_{CaSO_3}=0,005.120=0,6(g)\\ m_{H_2O}=0,005.18=0,09(g)\)

\(a)112ml=0,112l\\ n_{SO_2}=\dfrac{0,112}{22,4}=0,005mol\\ n_{Ca\left(OH\right)_2}=0,7.0,01=0,007mol\\ T=\dfrac{0,007}{0,005}=1,4\\ \Rightarrow tạo.CaSO_3\\ SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3+H_2O\\ b)\Rightarrow\dfrac{0,007}{1}>\dfrac{0,005}{1}\Rightarrow Ca\left(OH\right)_2.dư\\ n_{CaSO_3}=n_{Ca\left(OH\right)_2pư}=n_{SO_2}=0,005mol\\ m_{CaSO_3}=0,005.120=0,6g\\ m_{Ca\left(OH\right)_2dư}=\left(0,007-0,005\right).74=0,148g\)

a)

PTHH : \(SO_2+Ca\left(OH\right)_2\rightarrow CáO_4+H_2O\)

b)

Ta có :

\(n_{SO_2}=\frac{0,224}{22,4}=0,01\left(mol\right)\)

\(n_{Ca\left(OH\right)_2}=0,01\times1,4=0,014\)

Theo ptpư : \(n_{SO_2}=n_{Ca\left(OH\right)_2}=n_{CaSO_3}=n_{H_2O}\)

Vậy n_{Ca(OH)2 ( dư )} = \(n_{Ca\left(OH\right)_2\left(bđ\right)}-n_{Ca\left(OH\right)_2\left(pư\right)}\)

\(=0,014-0,001=0,004\left(mol\right)\)

\(n_{SO_2}=\dfrac{0,112}{22,4}=0,005\left(mol\right)\\ n_{Ca\left(OH\right)_2}=0,01\cdot0,7=0,007\left(mol\right)\\ PTHH:SO_2+Ca\left(OH\right)_2\rightarrow CaSO_3\downarrow+H_2O\\ \text{Vì }\dfrac{n_{SO_2}}{1}< \dfrac{n_{Ca\left(OH\right)_2}}{1}\text{ nên sau p/ứ }Ca\left(OH\right)_2\text{ dư}\\ \Rightarrow n_{CaSO_3}=n_{H_2O}=0,005\left(mol\right)\\ \Rightarrow\left\{{}\begin{matrix}m_{CaSO_3}=0,005\cdot120=0,6\left(g\right)\\m_{H_2O}=0,005\cdot18=0,09\left(g\right)\end{matrix}\right.\)

a+b)_Sau phản ứng thu được muối CaSO3.
nSO2=0.112/22.4=0.005(mol)
nCa(OH)2=0.7*0.01=0.007(mol)
---------------SO2+Ca(OH)2=>CaSO3+H2O
Trước pư--0.005->0.007(mol)
Pưng-------0.005-->0.005-->0.005(mol)
Sau pư----0--------->0.002(mol)
=>Ca(OH)2 dư 0.002 mol
=>mCa(OH)2 dư=0.002*74=0.148(g)
=>nCaSO3=0.005 mol
=>mCaSO3=0.005*120=0.6(g)

112ml = 0,112l 

700ml = 0,7 l

n SO2 = 0,112/ 22,4 =0,005 mol

n Ca(OH)2 = 0,7 . 0,01 = 0,007 mol

ta có tỉ lệ : n SO2 / n Ca(OH)2 = 0,005 / 0,007 =0,714 < 1 ---> pứ tạo muối CaSO3 

pthh SO2 + Ca(OH)2 ---> CaSO3 + H2O

theo pthh n CaSO3 = n Ca(OH)2 = 0,007 mol

---> m CaSO3 = 0,007 . 120= 0,84 g

Chọn C

S O 2 hết, Ca( O H ) 2 dư, phản ứng tạo muối CaS O 3