Answer
The mole ratio of H2O to H2SO4 is 2:1
Step-by-step explanation
Given chemical equation:

From the balanced chemical equation above, 2 moles of NaOH react with sulfuric acid, 1 mole of H2SO4, to produce 2 moles of water and 1 mole sodium sulfate.
So, from the chemical equation, you have a 2:1 mole ratio between H2O and H2SO4