Calculate Percent of Oxalic Acid H2C2O4

[Gene]

I need help in a college chemistry class and am really struggling.

The problem is as follows:

Calculate the percent of oxalic acid (H2C2O4) in a solid sample, given that a 0.7984 g of that sample required 37.98 mL of 0.2283 M NaOH solution for neturalization.

I think I have the first part which is the percent composition for H2C2O4 which I calculated at 2.24% for H, 26.68 % for C, 71.08% for O.

Not sure if this is correct or even how to proceed from here.

I can't even find anything similar to even give me a starting point.

Any help would be much appreciated. - Thanks