S+O2--->SO2(1)
SO2+2NaOH---->Na2CO3+H2O(2)
a)Ta có
n\(_S=\frac{6,4}{32}=0,2\left(mol\right)\)
Theo pthh
n\(_{SO2}=n_S=0,2\left(mol\right)\)
n\(_{NaOH}=2n_{SO2}=0,4\left(mol\right)\)
mdd=\(\frac{0,4.40.100}{20}=80\left(g\right)\)
b
Theo pthh
n\(_{Na2CO3}=n_{SO2}=0,2\left(mol\right)\)
m\(_{Na2SO3}=0,2.126=25,2\left(g\right)\)