\(Na_2SO_3+H_2SO_4\rightarrow Na_2SO_4+H_2O+SO_2\uparrow\)
\(n_{Na2SO3}=\frac{12,6}{126}=0,1\left(mol\right)\)
\(n_{SO2}=n_{Na2SO3}=0,1\left(mol\right)\Rightarrow V_{SO2}=0,1.22,4=2,24\left(l\right)\)
Trong dd A có Na2SO4
\(n_{Na2SO4}=n_{Na2SO3}=0,1\left(mol\right)\)
\(m_{Na2SO4}=0,1.142=14,2\left(g\right)\)
\(m_{Dd_{Spu}}=12,6+80-\left(0,1.64\right)=86,2\left(g\right)\)
\(\Rightarrow C\%_{Na2SO4}=\frac{14,2}{86,2}.100\%=16,47\%\)
Na2SO3+H2SO4--->Na2SO4+H2O+SO2
a) n Na2SO3=12,6/126=0,1(mol)
n SO2=n Na2SO3=0,1(mol)
V=V SO2=0,1.22,4=2,24(l)
b) Tính nồng độ mol hay nồng độ % hả bạn