Some Basic Concepts · Limiting reagent gas volume

What volume of hydrogen gas at STP would be liberated by action of 50 mL of $\ce{H2SO4}$ of 50% purity (density $= 1.3$ g mL$^{-1}$) on 20 g of zinc ?

Given : Molar mass of H, O, S, Zn are 1, 16, 32, 65 g mol$^{-1}$ respectively.