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Density is defined as the mass per unit volume.

This property can be used to identify a compound or an element, since the density of a pure substance is a constant. Since density relates mass and volume, it can be used to find the volume occupied by a given mass, or if the volume is known, we can find the mass.
Density of water is 1.0 g/ml.
Let's explore some calculations involving density. You'll see that these calculations have tremendous laboratory significance.

Example 1-8

The density of carbon tetrachloride is about 1.6 g/ml at 20oC. Calculate the volume occupied by 320 g of CCl4.



So, 320 grams of carbon tetrachloride will occupy a volume of 200 ml.


Example 1-9

A 20 ml sample of mercury has a mass of 271 g. Calculate the density of mercury.




This question tests your knowledge of a basic equation. Though the equation is simple, you should be able to manipulate this equation so that you can connect this piece of information with other facts and formulas that are given in your test question or passage.

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