Question #ab103

1 Answer
Oct 17, 2017

"70 g"70 g

Explanation:

The idea here is that the density of the object tells you the mass of "1 cm"^31 cm3 of this object.

In this case, you know that the density is equal to "7.2 g cm"^(-3)7.2 g cm3, which means that "1 cm"^31 cm3 of this object has a mass of "7.2 g"7.2 g.

This implies that your sample will have a mass of

10 color(red)(cancel(color(black)("cm"^3))) * "7.2 g"/(1color(red)(cancel(color(black)("cm"^3)))) = "72 g"

Now, notice that you have one significant figure for the volume of the object. This implies that the answer must be rounded to one significant figure.

"mass" = color(darkgreen)(ul(color(black)("70 g")))