a) Na2SO3 + 2HCl---->2NaCl +H2O+SO2
b) Ta có
n\(_{Na2SO3}=\frac{12,6}{126}=0,1\left(mol\right)\)
Theo pthh
n\(_{SO2}=n_{Na2SO4}=0,1\left(mol\right)\)
V\(_{SO2}=0,1.22,4=2,24\left(l\right)\)
c) Theo pthh
n\(_{HCl}=2n_{Na2SO4}=0,2\left(mol\right)\)
m\(_{dd}=\)\(\frac{0,2.36,5.100}{5}=142\left(g\right)\)
m\(_{dd}=16,2+142-64=94,2\left(g\right)\)
Theo pthh
n\(_{NaCl}=2n_{Na2SO4}=0,2\left(mol\right)\)
C%=\(\frac{0,2.58,5}{94,2}.100\%=12,42\%\)
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