What is the mass, in grams, of 28.66 ml of acetone?

When mass = density * volume

and we here have the density of acetone= 0.7857 g /Cm^3

and the volume = 28.66 mL

so by substitution:

∴ the mass of the acetone = 0.7857g *28.66

                                          = 22.5 g

Is a logical series of steps