What volume of hydrogen gas at STP would be liberated by action of 50 mL of H_2 SO_4 of 50 % purity (density =1.3 g mL^-1 ) on 20 g of zinc? Given:…

What volume of hydrogen gas at STP would be liberated by action of $\displaystyle 50$ mL of $\displaystyle \mathrm{H}_2 \mathrm{SO}_4$ of $\displaystyle 50 \%$ purity (density $\displaystyle =1.3 \mathrm{~g} \mathrm{~mL}^{-1}$ ) on $\displaystyle 20$ g of zinc ? Given : Molar mass of H, O, S, Zn are $\displaystyle 1$, $\displaystyle 16$, $\displaystyle 32$, $\displaystyle 65 \mathrm{~g} \mathrm{~mol}^{-1}$ respectively.