J.R. S. answered 01/26/19
Ph.D. in Biochemistry--University Professor--Chemistry Tutor
Density is defined as mass per unit volume. The mass is 250 grams. The volume occupied by that mass is 522 mls. Thus, the density of the object is 250 g/522 mls = 0.479 g/ml = 0.48 g/ml (2 sig. figs.).