Answer
Please see the work below.
Work Step by Step
As we know that
$PV=nRT$
This can be rearranged as:
$n=\frac{PV}{RT}$
We plug in the known values to obtain:
$n=\frac{96747\times 0.00126}{8.31\times 295}=0.0498moles$
The chemical reaction is :
$Zn+2HCl\rightarrow ZnCl_2+H_2$
Moles ratio of $Zn:H_2=1:1$
so moles of Zn=0.049
$Mass \space of \space Zn=moles\times molar\space mass=0.0498\times 65.39=3.26g$
$percentage \space mass \space of Zn=\frac{3.26}{6.11}\times 100\%=53.4\%zinc$
