Chem questions!!!?

In a titration experiment, a 17.61 mL sample of 0.0169M Ba(OH)2 just neutralized 14.5mL of HNO3 solution. Calculate the molarity of the HNO3 solution. Answer in units of M.

question 2 is: A 21.9 mL sample of 0.216 M KOH solution required 22.4 mL of aqueous acetic acid solution in a titration experiment. Calculate the molarity of the acetic acid solution. Answer in units of M.

question 3 is: You have a vinegar solution you believe to be 1 M. You are going to titrate 18.94 mL of it with a NaOH solution that you know to be 0.688 M. At what volume of added NaOH solution would you expect to see an end point? Answer in units of mL.