Use the actual volumes of NaOH and H2SO4 from your data section to calculate the moles of each reactant, the mole ratio of NaOH to H2SO4 being reacted, and the moles of Na2SO4 that should be formed (theoretical yields) based on the amounts of reactants available; determine which reactant is the limiting reactant.
If you enter scientifc notation, use "E" notation, 2.51E-3.