Density:
The density of a substance is equal to the ratio of its mass and volume. In general we can say the density of a substance is mass per unit volume.
Density = mass in g / volume in cubic cm or ml
Given that
Density = 0.940 g/ ml
Mass = 48.0 g
Therefore,
Volume = mass/ density
= 48.0 g/ 0.940 g/ ml
= 51 ml
Thus the correct answer is 51 ml