If an object made of aluminum has a mass of 8.37g When it was placed in a graduated cylinder containing 20.0 ml of water the water level rose to 23.1 ml What is the density and specific gravity of?

Water level rise is an indicator of the volume of the object,

V = 23.1 - 20.0 = 3.1 mL

Density = Mass / Volume

= 8.37 / 3.1 = 2.7 g/mL (or 2700 kg/m^3)

Specific gravity is the ratio of the density of the material to the density of water at a given temperature.

Specific Gravity = (2.7 g/mL) / (1.0 g/mL)