posted by Mike .
a. Determine the density of a cube of copper with a length of 5.00 cm and a mass of 1,112.50 g.
b. Calculate the number of atoms in the cube
since density = mass/volume, we have
= 1112.50/125.00 g/cm^3
# atoms is
g * moles/g * 6.02*10^23 atoms/mole
So, just look up the atomic weight of copper and plug it in.