# Question #03bbc

##### 1 Answer

#### Explanation:

A substance's **density** tells you the mass of exactly **unit of volume** of said substance.

In your case, the density of sodium chloride is said to be equal to **every**

You can write this as a ratio of mass to volume

#"2.16 g"/"1 cm"^3-># thedensityof sodium chloride

Now, you know that your sample has a volume of

To do that, set up the equation as

#(color(blue)(?)color(white)(.)"g")/"4.00 cm"^3 = "2.16 g"/"1 cm"^3#

Rearrange and solve to find

#color(blue)(?) = (4.00 color(red)(cancel(color(black)("cm"^3))))/(1color(red)(cancel(color(black)("cm"^3)))) * "2.16 g" = color(darkgreen)(ul(color(black)("8.64 g")))#

The answer is rounded to three **sig figs**.