What volume of 3.00 M NaOH is required to neutralize a 1.00 L solution containing 98.0 g of H2SO4?

Well, 98g of sulfuric acid is approximately 1mol.H2SO4. This compound, a very strong acid, dissociates giving off two protons in its aqueous form. So, because NaOH only disociates into one mole Na and one mole OH, you need twice as much OH to H2SO4. Therefore you will need only 2 moles NaOH. This means 2/3 of a liter or 666mL or .666L of NaOH.