Attempting test corrections from a chemistry test on the ones that I got wrong for extra credit. Can't remember how to solve this one. "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

Attempting test corrections from a chemistry test on the ones that I got wrong for extra credit. Can't remember how to solve this one. "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?"

cpinder · Answer

density=mass/volume. in order to find this, you need the mass of the unknown metal. to calculate that, take the total mass of the cylinder, water, and metal and then subtract the mass of just the cylinder and water. 156g-105.5g=50.5g

to find the volume of the metal, take the water level after the metal was added and subtract the initial volume. 30.7mL-25mL=5.7mL

then to find the density, divide the mass by the volume. 50.5g/5.7mL=8.86 g/mL