A graduated cylinder was filled with water to the 25.0 mL mark and weighed. Its mass was 105.5g. An object made of an unknown metal was placed in the cylinder and completely submerged in the water. The water level rose to 30.7 mL. When reweighed, the cylinder, water and metal object had a total mass of 156.0g. Based on these measurement, what is the density of the unknown metal?

Question

A graduated cylinder was filled with water to the 25.0 mL mark and weighed. Its mass was 105.5g. An object made of an unknown metal was placed in the cylinder and completely submerged in the water. The water level rose to 30.7 mL. When reweighed, the cylinder, water and metal object had a total mass of 156.0g.  Based on these measurement, what is the density of the unknown metal?

anonymous · Answer

The change in the volume of the water can be used to determine the volume of the metal. The change in mass will give the mass of the metal. Then,
$$\color{green}{\rho = \frac{m}{V}}$$

anonymous · Answer

so does the total mass go on top so its 156.0 divided by the change in volume so it would 5 do you subtract the volumes?

anonymous · Answer

Subtract the initial mass from the final mass. Don't use the total mass.