A student places 15.0 mL of water in a graduated cylinder. She then places an object with an

into the same cylinder. The final volume now reads 20.0 mL

a. What is the volume of the unknown object?

. If the object has a mass of 23 g, what is its density to one decimal place? Do not forget units. (Density

mass/volume)

d = 4.6 g/mL

Explanation:

Volume of water = 15.0 mL

Final volume after placing object = 20.0 mL

Volume of object = ?

Mass of object = 23 g

Density of object = ?

Solution:

Volume of object = Total volume - volume of water

Volume of object = 20.0 mL - 15.0 mL

Volume of object = 5.0 mL

Density of object:

density = mass / volume

d = m/v

d = 23 g / 5.0 mL

d = 4.6 g/mL