How many grams of (H2SO4) are required to react completely with 15.0 grams of zinc in this Reaction?

Atomic weight of Zinc is 65,38 , so 15g is 0,23 moles. You need the same molar quantity of H2SO4. Molecular weight of sulphuric acid is 98 g/mol and 98 . 0,23 = 22,54g :-).