A student standardizes an unknown solid diprotic acid, \(\text{H}_2\text{A}\), by dissolving a sample in distilled water to prepare a stock solution and titrating an aliquot with standardized \(\text{NaOH(aq)}\) to the second equivalence point according to the following equation:

\[ \text{H}_2\text{A(aq)} + 2\,\text{NaOH(aq)} \rightarrow \text{Na}_2\text{A(aq)} + 2\,\text{H}_2\text{O(l)} \]

The student records the laboratory data shown in the table below.

Measurement	Value
Mass of unknown \(\text{H}_2\text{A}\) dissolved	\(1.800 \text{ g}\)
Total volume of prepared stock solution	\(250.0 \text{ mL}\)
Volume of stock solution titrated (aliquot)	\(50.00 \text{ mL}\)
Concentration of standardized \(\text{NaOH(aq)}\)	\(0.100 \text{ M}\)
Initial \(\text{NaOH}\) buret reading	\(3.50 \text{ mL}\)
Final \(\text{NaOH}\) buret reading at second equivalence point	\(43.50 \text{ mL}\)

Based on the data collected, what is the molar mass of the unknown diprotic acid?