Question #ab103

1 Answer
Oct 17, 2017

Answer:

#"70 g"#

Explanation:

The idea here is that the density of the object tells you the mass of #"1 cm"^3# of this object.

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