Titration Help!?

Ok so in chemistry i did a titration lab where i took 2.98 g of NaOH and dissolved it in 250 mL of water. Then i took 0.49 grams of the monoprotic acid "HX" and dissolved that in 50 mL of water. I then titrated the NaOH into the Erlenmeyer flask containing the acid solution until it balanced out with 8.63 mL of NaOH solution with the HX solution. The problem of the lab is to find the molar m of HX. I keep getting about 189 g/mol but it doesnt seem right...anyone want to check my answer??