\(\left\{{}\begin{matrix}n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\\n_{KOH}=1.0,2=0,2\left(mol\right)\end{matrix}\right.\)
Xét tỉ lệ: \(\dfrac{n_{KOH}}{n_{SO_2}}=\dfrac{0,2}{0,3}=0,67\) => Tạo muối KHSO3
PTHH: KOH + SO2 --> KHSO3
0,2------------->0,2
=> mKHSO3 = 0,2.120 = 24 (g)