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