Question

what do you understand when we say that the density of copper is 8.9 gram centimeter per cubic​.​.​

Answer 1

#BAL

The density of copper should be the same in a wire as it is in a chunk,

so the answer is 8.9 g/cm3.

 

 

However, I'm assuming that this problem is really looking for the volume of the copper chunk.  

 

Think of density as a conversion factor that you can use to convert mass→volume or volume→mass.  

It's (8.9 g / 1 cm3) or (1 cm3 / 8.9 g).

 

To solve this problem, multiply 250 g by the latter.  It's the same as dividing the mass by the density, but that's really not important here.  As long as the units cancel out to a volume unit, everything's fine.  

 

250 g x (1 cm3 / 8.9 g) = 28 cm3