1ml=1 cc
If the water rose 7 ml−2ml=5ml then the stone had a volume of 5 ml or 5cc
With a mass of 25 g it must have a density of = 25 g
5 cc= 5 g/cc
Density is the substance's mass per unit of volume. The symbol most often used for density is ρ although the Latin letter D can also be used. For example, a block of the heavier element lead (Pb) will be denser than the softer, lighter element gold (Au). A block of Styrofoam is less dense than a brick. It is defined as mass per unit volume.
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