Find moles of NaOH required(used) to react with CH3COOH.

Question

The volume of NaOH used was 7.70mL and the actual molarity of NaOH solution is .275 mol/L.

Answer 1

you don't say how much CH3COOH is involved.
So who knows how much NaOH will be needed?

But, the amount of NaOH present is

7.70mL * 1L/1000mL * 0.275 mol/L = 0.00212 mol