A graduated cylinder has 22 ml of water placed in it. An irregularly shaped rock is then placed in the graduated cylinder and the volume of the rock and water in the graduated cylinder now...

A graduated cylinder has 22 ml of water placed in it. An irregularly shaped rock is then placed in the graduated cylinder and the volume of the rock and water in the graduated cylinder now reads 30 ml. The mass of the rock is 24 g. Find the volume of the rock. Find the density of the rock. 

Expert Answers
t-nez eNotes educator| Certified Educator

Density is a property of matter that tells us how heavy something is for its size. It's determined by dividing an object's mass by its volume: d=m/V.

The volume of the rock can be determined by the amount of water it displaces. It's the difference between the volume of the water and rock combined and the volume of the water alone:

V = 30. ml - 22 ml = 8.0 ml

The mass of the rock is given, m = 24 grams

so density = m/V = 24 g/8.0 ml = 3.0 g/ml

Here are some other common units for expressing density:

g/cm^3 = this is the same as g/ml because 1 ml = 1 cm^3

Kg/L = this is also equivalent to g/ml because 1 Kg is 1000 grams and 1 liter is 1000 milliliters.

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