Answer
The mass of acetone is 22.4g.
Work Step by Step
The mass, of liquid (acetone) is calculated as $mass = density \times volume$
Before substituting the values of density and volume into the above equation, convert the given volume from milliliters to cubic centimeters.
To convert to mL to $cm^3$, first write the correct conversion factor using the following relationship:
$1 cm^3 = 1 mL$
$28.56 mL = 28.56 cm^3$
Hence, the volume of acetone is $28.56 cm^3$
Substitute $0.7857 g/cm^3$ for $d$ and $28.56 cm^3$ for $V$ in the above expression, thus,
$m = ( 0.7857 g/cm^3 ) x 28.56 cm^3$
$ = 22.4 g$
