\(n_{SO_2}=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
PTHH: 2Fe + 6H2SO4(đặc, nóng) ---> Fe2(SO4)3 + 3SO2 + 6H2O
0,1<---------0,3
=> mFe2(SO4)3 = 0,1.400 = 40 (g)
\(nFe=\dfrac{15,12}{56}=0,27\left(mol\right)\)
\(nSO_2=\dfrac{6,72}{22,4}=0,3\left(mol\right)\)
2Fe+6H\(_2\)SO\(_4\)> Fe\(_2\)(SO4)\(_3\)+H\(_2\)O+3SO\(_2\)
LTL : 0,27/2 < 0,3/3
=> Fe td hết
=> \(nFe_2\left(SO_4\right)_3=\dfrac{1}{2}.nFe=\dfrac{1}{2}.0,27=0,135\left(mol\right)\)
=> \(m\left(muối\right)=mFe_2\left(SO_4\right)_3=0,135.400=54\left(g\right)\)