$a,PTPƯ:Zn+2HCl\xrightarrow{} ZnCl_2+H_2↑$
$n_{Zn}=\dfrac{19,5}{65}=0,3mol.$
$Theo$ $pt:$ $n_{H_2}=n_{Zn}=0,3mol.$
$⇒V_{H_2}=0,3.22,4=6,72l.$
$b,PTPƯ:Fe_2O_3+3H_2\xrightarrow{t^o} 2Fe+3H_2O$
$n_{Fe_2O_3}=\dfrac{19,2}{160}=0,12mol.$
$\text{Lập tỉ lệ:}$ $\dfrac{0,12}{1}>\dfrac{0,3}{3}$
$⇒Fe_2O_3$ $dư.$
$Theo$ $pt:$ $n_{Fe}=\dfrac{2}{3}n_{H_2}=0,2mol.$
$⇒m_{Fe}=0,2.56=11,2g.$
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