How many copper atoms are there in a solid cube of copper which is 1.00 cm on each side? What is the approximatesize of atom ? The atomic mass of copper is 63.6 g/mol and the density is 8.96 g/cm3.

The volume of the copper cube is 1 cm3. So the mass is 8.96 g. = 8.9663.6=0.14 mole of copper.
Now 1 mole copper is equal to 6.023×1023 number of atoms. Therefore number of atoms in the cube is 6.023×1023×0.14=8.43×1022.

Now the approximate size of an atom is volume number of atoms=18.43×1022=1.18 cm3

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