\(n_{H_2}=\dfrac{2.8}{22.4}=0.125\left(mol\right)\)
\(Fe_2O_3+3H_2\underrightarrow{^{t^0}}2Fe+3H_2O\)
\(\dfrac{1}{24}.....0.125\)
\(m_{Fe_2O_3}=\dfrac{1}{24}\cdot160=6.67\left(g\right)\)
\(Zn+2HCl\rightarrow ZnCl_2+H_2\)
\(n_{Zn}=n_{H_2}=0.125\left(mol\right)\)
\(m_{Zn}=0.125\cdot65=8.125\left(g\right)\)