Answer:
0.400 mL
Explanation:
Hello, the dilution factor (in folds) is given by:
[tex]folds=\frac{total_{volume}}{sample_{volume}}[/tex]
Thus, the sample volume with three significant figures is given by:
[tex]sample_{volume}=\frac{2mL}{5"folds"}=0.400 mL[/tex]
Best regards.
