# chemistry

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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

• chemistry -

since density = mass/volume, we have

1112.50g/(5.00cm)^3
= 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.

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