The empirical formula is $\mathrm{C}_{9} \mathrm{H}_{8} \mathrm{O}_{4}$. The atomic mass of carbon (C) is approximately 12 g/mol, hydrogen (H) is approximately 1 g/mol, and oxygen (O) is approximately 16 g/mol. So, the mass of the empirical formula is $9 \times 12
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