To calculate the mass of 125 mL of trimethyl citrate, you need to know its density. Trimethyl citrate has a density of approximately 1.15 g/mL.
Using the formula:
\[
\text{Mass} = \text{Volume} \times \text{Density}
\]
you can calculate the mass as follows:
\[
\text{Mass} = 125 \, \text{mL} \times 1.15 \, \text{g/mL} = 143.75 \, \text{g}
\]
Therefore, the mass of 125 mL of trimethyl citrate is approximately 143.75 grams.