Mass of unknown acid $0\mathrm{.}265$ g

Initial Reading NaOH: $0$ mL

Final reading $15$ mL

Volume used of NaOH used $15$ mL

Mass of unknown acid: $0\mathrm{.}6208$ g

Initial reading of NaOH $15$ mL

Final Reading: $2\mathrm{.}70$ mL

Volume of NaOH used: $37\mathrm{.}7$ mL

What is the calculation to get the moles of NaOH?

Moles of H$+$ in sample?

Molar Mass of unknown in g$/$mol$?$

The avaerage molar mass in g$/$mol$?$