\(\left\{{}\begin{matrix}n_{SO2}=\frac{0,56}{22,4}=0,025\left(mol\right)\\n_{KOH}=0,2.0,3=0,06\left(mol\right)\end{matrix}\right.\Rightarrow\frac{n_{KOH}}{n_{SO2}}=2,4\)
Tạo 1 muối K2SO3
\(2KOH+SO_2\rightarrow K_2SO_3+H_2O\)
\(n_{K2SO3}=n_{SO2}=0,025\left(mol\right)\)
\(\Rightarrow m_{K2SO3}=0,025.158=3,95\left(g\right)\)