A graduated cylinder is filled with water to a level of 40.0 mL. When a piece of copper is lowered into the cylinder, the water level rises to 63.4 mL. Find the volume of the copper sample. If the density of the copper is 8.9 g/cm3, what is its mass?

Answer 1

the difference in the levels is due to the water displaced by the volume of Cu
... so the volume of the Cu sample is ... 63.4 mL - 40.0 mL
... a mL is equivalent to a cm^3

mass = volume * density