Gọi\(\left\{{}\begin{matrix}n_{Fe}=a\left(mol\right)\\n_{FeS}=b\left(mol\right)\end{matrix}\right.\)
mH2SO4 = 150.9,8% = 14,7 (g)
-> nH2SO4 = \(\dfrac{14,7}{98}=0,15\left(mol\right)\)
\(n_{hhkhí\left(H_2,H_2S\right)}=\dfrac{\dfrac{224}{1000}}{22,4}=0,01\left(mol\right)\)
PTHH:
Fe + H2SO4 ---> FeSO4 + H2
a a a a
FeS + H2SO4 ---> FeSO4 + H2S
b b b b
Hệ phương trình\(\left\{{}\begin{matrix}56a+88b=0,72\\a+b=0,01\end{matrix}\right.\Leftrightarrow\left\{{}\begin{matrix}a=0,005\left(mol\right)\\b=0,005\left(mol\right)\end{matrix}\right.\)
=> \(\left\{{}\begin{matrix}m_{Fe}=0,005.56=0,28\left(g\right)\\m_{FeS}=0,005.88=0,44\left(g\right)\end{matrix}\right.\)
\(n_{H_2SO_4\left(pư\right)}=0,005+0,005=0,01\left(mol\right)\\ \Rightarrow n_{H_2SO_4\left(dư\right)}=0,15-0,01=0,14\left(mol\right)\\ m_{ddY}=0,72+150-0,005.2+0,005.34=150,88\left(g\right)\)
=> \(\left\{{}\begin{matrix}C\%_{FeSO_4}=\dfrac{152.\left(0,005+0,005\right)}{150,88}=1\%\\C\%_{H_2SO_4}=\dfrac{98.0,14}{150,88}=9,1\%\end{matrix}\right.\)