# Question #819ef

##### 1 Answer

#### Explanation:

The **density** of a material is simply the mass of exactly one unit of volume of that material.

In this case, you know that a

You can set up a conversion factor that has the mass of the sample as the numerator and the volume it occupies as the denominator.

You will have

#1 color(red)(cancel(color(black)("cm"^3))) * "81 g"/(25color(red)(cancel(color(black)("cm"^3)))) = "3.24 g"#

So, if

#color(darkgreen)(ul(color(black)("density"))) = "3.24 g cm"^(-3) ~~ color(darkgreen)(ul(color(black)("3.2 g cm"^(-3))))#

The answer must be rounded to two **sig figs**, the number of sig figs you have for your values.