\(n_{SO_2}=\dfrac{2.8}{22.4}=0.125\left(mol\right)\)
\(n_{Fe}=a\left(mol\right),n_{Zn}=b\left(mol\right)\)
\(m=56a+65b=6.05\left(g\right)\left(1\right)\)
\(\text{Bảo toàn e : }\)
\(3a+2b=0.125\cdot2=0.25\left(2\right)\)
\(\left(1\right),\left(2\right):\)
\(a=b=0.05\)
\(\%Fe=\dfrac{0.05\cdot56}{6.05}\cdot100\%=46.28\%\)
\(\%Zn=53.72\%\)