Answer
105 g
Work Step by Step
$\text{Mass of the solution}=\text{Density}\times\text{Volume}$
$=1.049\, g/mL\times250.0\, mL$
$=262.25\, g$
$\text{Mass of ascetic acid}=262.25\,g\times\frac{40.0}{100}$
$=105\, g$
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